When bears sleep Why does a bear suck its paw? Winter sleep and awakening

It's no secret that the Siberian winter is a difficult test for many animals, and bears are no exception.

In common parlance, it is said that the bear hibernates, biologists say - in winter sleep. Detailed information about this interesting process A little. main reason is the complexity of data collection.

The brown bear is found everywhere in the reserve, both in all types of forests and in the mountain-tundra belt. On the territory of the reserve, it makes seasonal movements from forests to the high-mountain belt and back, often using trails and country roads for roaming.

What does a bear eat before hibernation?

Before going into a den, the owner of the taiga must accumulate nutrients. The bear is an omnivore, but most of its diet in the Kuznetsk Alatau, as in many other places, consists of food of plant origin: berries, herbaceous plants, acorns, nuts.

Pine cones are one of the bears' favorite treats and one of the best fattening foods. Young animals can climb trees after them and break off branches. But mostly they collect fallen cones from the ground. To get to the nuts, the bear collects the cones in a heap and crushes them with his paws, from where he then, lying on the ground, selects the nuts along with the shell with his tongue. The shell is partly thrown away during the meal, and partly eaten.

Often the attention of the bears is attracted by the stocks of nuts made by the chipmunks. Digging the holes of animals, the bears get to the nuts and eat them, often together with the owner. They do not miss the opportunity to feast on ant larvae, bird eggs or fish, they also hunt small rodents and hoofed animals. The brown bear rarely kills wild ungulates on his own, he mainly devours them in the form of carrion or selects the prey of other predators (wolf, lynx, wolverine).

The facts of eating by a predator of such species of wild ungulates as an elk, a deer, a roe deer are known. He fills up prey or found carrion with brushwood and keeps nearby until he finishes the carcass completely. If the animal is not very hungry, it often waits for several days until the meat becomes softer.

It is very important how fruitful the year was for fattening feed. Bad harvest years can greatly delay the timing of bears in dens, and the animals can continue to feed even in twenty-degree frosts and almost half a meter of snow, digging cones from under the snow, trying to gain the fat reserve necessary for wintering. In years favorable for food, adult bears accumulate a layer of subcutaneous fat up to 8-12 cm, and the weight of fat reserves reaches 40% of the total weight of the animal. It is this fat accumulated over the summer and autumn that the bear's body feeds on in winter, experiencing the harsh winter period with the least hardships.

Hungry years lead to rod bears

These are animals that have not had time to gain a sufficient supply of fat, which is why they cannot hibernate. Rods, as a rule, are doomed to death from hunger and frost or from a hunter. But not every bear that meets in the winter in the forest will be a connecting rod. During "after-hours" bears appear in the forest, whose sleep in the den is disturbed. Normally well-fed, but pulled out of hibernation, the bear is forced to look for a new, calmer haven for sleep. Often the sleep of animals is interrupted by human anxiety.

bear den

Before going to the den, the bear diligently confuses the tracks: it winds, goes along windbreaks and even goes backwards in its own footsteps. For lairs, deaf and reliable places are usually chosen. Often they are located along the edges of impenetrable swamps, along the shores of forest lakes and rivers, in windbreaks and logging sites. The brown bear arranges its winter dwelling in recesses under twisted roots or tree trunks, sometimes on a pile of brushwood or near an old woodpile. Less often, he chooses a cave for his house or digs deep earthen holes - ground lairs. The main condition is that the dwelling should be dry, quiet and isolated from the presence of unexpected guests. One of the signs of the proximity of the den is large bald spots in the moss, gnawed or broken trees. The beast insulates its shelter with branches, and layers of moss lines the litter. Sometimes the bedding layer reaches half a meter. It happens that several generations of bears use the same den.

At the beginning of winter, bears have offspring

From one to four, but more often two bear cubs are born. Babies are born blind, without hair and teeth. They weigh only half a kilogram and barely reach 25 cm in length. It is interesting that the nipples of the she-bear are not located along the line of the abdomen, as in most animals, but in the very warm places: in the armpits and inguinal cavities. The cubs feed on 20% fat milk from their still-sleeping mother and grow quickly. In a few months of such food, the cubs are completely transformed, and they leave the den already furry and nimble. True, still very dependent.

How does a bear sleep in a den

In the den, warm and safe, the bears sleep through the long and cold winter. Often the bear sleeps on its side, curled up in a ball, sometimes on its back, less often it sits with its head between its paws. If the animal is disturbed during sleep, it easily wakes up. Often the bear itself leaves the den during long thaws, returning to it at the slightest cold snap.

Animals falling into hibernation (for example, hedgehogs, chipmunks, etc.) become numb, their body temperature drops sharply, and, although vital activity continues, its signs are almost imperceptible. In a bear, the body temperature drops slightly, by only 3-5 degrees and fluctuates between 29 and 34 degrees. The heart beats rhythmically, although more slowly than usual, breathing becomes somewhat less frequent. The animal does not urinate or defecate. Any other animal in this case would have been fatally poisoned in a week, and bears begin unique process of recycling waste products into useful proteins. A hard plug forms in the rectum, which some call a "sleeve". The predator loses it as soon as it leaves the lair. The cork consists of tightly pressed dry grass, the hair of the bear itself, ants, pieces of resin and needles.

Brown bears sleep alone, and only females who have cubs of the year go to bed with their cubs. The duration of hibernation depends on weather conditions, health and age of the animal. But usually this is the period from the second half of November to the first half of April.

Why does a bear suck its paw

There is a funny opinion that a bear sucks its paw during hibernation. But in fact, in January, February happens change of hard skin on the paw pads, while the old skin bursts, flakes, and itches a lot, and in order to somehow reduce these discomfort animal licks its paws.

It took more than one thousand years natural selection to form such a complex system adaptations, as a result of which bears have acquired the ability to survive in areas with harsh climatic conditions. It remains only to be surprised at the diversity and wisdom of nature.

Previously on Bears:

V. NIKOLAENKO.

"Photographing bears is a very dangerous occupation. I have been photographing them for 30 years. Over time, courage has significantly diminished, experience has gained. But no experience guarantees safety." These are the words of Vitaly Aleksandrovich Nikolaenko, a remarkable nature researcher who devoted his whole life to photographing and studying Kamchatka bears. It so happened that his article "Hello bear! How are you?" ("Science and Life" No. 12, 2003) was the last lifetime publication. At the end of December 2003, Vitaly Aleksandrovich was observing a bear that had not lain in a den. Leaving his backpack and skis behind, he followed the animal tracks, obviously hoping to take a few pictures. But it is impossible to predict the behavior of even a familiar bear - Nikolaenko himself spoke about this. And he had already had collisions with bears, fraught with serious danger. Last meeting with a stranger ended tragically ... In memory of Vitaly Alexandrovich Nikolaenko, we publish notes that were not included in the previous article.

Science and life // Illustrations

Vitaly Alexandrovich Nikolaenko.

While fishing, the bear quenches its thirst by plunging its muzzle deep into the water.

The bear comes to the river not only for fish, but also to take a bath.

The bear arranges its beds in the snow, warming them with branches or birch dust.

After leaving the den, the cubs like to lie in the snow.

Family of the yearlings.

BERLOGS

Berloga is winter shelter animal, which provides optimal microclimatic conditions that allow you to survive a long period of adverse food and weather conditions with minimal expenditure of energy resources. For females, it also serves as a maternity hospital, and for newborns - a nursery.

The forty lairs that I managed to find and describe were unpaved. Hunters from the south of the Kamchatka Peninsula talk about lairs that are located in rocky caves, but there is no reliable data on this. I myself discovered only one unexplored lair among volcanic blocks, on the shore of Kuril Lake. Through a narrow triangular hole, the animal penetrated into the den chamber formed by the flat sides of the boulders. The length of the lair reached 2.5 m, and its bottom was covered with volcanic slag. At the far end is a shallow bed. Two dark spots on the back wall testified that bears have been using this den for more than a dozen years.

The first to winter are females with underyearlings (first-years) and young individuals. A mass departure to the dens occurs from mid-October. Animals spend two or three weeks near the dens and lie in them in early and mid-November. For some time they can still leave the dens, lie nearby during the day, and hide inside at night. Bears do not dig a den in advance. The stories that the bear, going to the den, confuses the tracks, winds, are the fantasies of the hunters. Observations have shown that bears really meander in alder forests during this period, avoid open spaces and actively mark trees in recreation areas. But the winding is nothing more than a reaction to an unconscious, uncomfortable mental state that prompts the bear to seek safe cover. The bear knows the habitat well and, leaving the spawning ground for the den, finds two or three old dens, sometimes already occupied by other bears. I have never seen a bear contest the right to an occupied lair.

Most of the lairs are located in thickets of alder elfin, on the slopes of ridges and ravines, along dry stream beds. They can be divided into three groups according to their shape. The first ones are pear-shaped, with a well-defined elongated manhole between the forehead (hole of the lair) and the lair chamber, with a lying position at the back wall. The second ones are spherical or ovoid in shape, without an oblong manhole; their height, width and length do not differ much in size, and the depression of the bed is a continuation of the walls of the lair. Still others are tortoise-shaped, with a flat oval bottom; their length is 1.5-2 times greater than the width, the top is hemispherical, stretched on the sides, the height reaches 100-130 cm, and the width in the center is almost 2 times more height. The bed is located at the back wall of the lair and is its continuation. In all lairs, the back walls are flatter than the side walls.

The most durable lairs are located under the rhizomes of birches. Their roof rests on overgrown roots. As a rule, such dens have been used for decades by both family groups and dominant males.

If the bear does not find a ready lair, he builds a new one. The bear digs a den with both front paws. A slight shift of the berlozhny camera to the left or right side depends on which paw the animal works more - left or right. The soil is thrown out of the den between the hind legs or sideways. How he manages to scoop out up to ten cubic meters of earth through a narrow hole remains a mystery. He climbs into the den like a plastuna, on his elbows, stretching his hind legs, and gets out of it in the same way, crawling. The volume of the lair is proportional to the size of the animal's body. Its length and width should be no less than the length of the body, and its height should be slightly more than the height of the body at the withers, so that, sitting in the prone position, the animal does not rest its head on the ceiling. Digging a lair takes two to three days. Thick rhizomes that interfere with the passage are gnawed out by the bear and thrown out. Several fragments of rhizomes may remain in the den.

WINTER SLEEP AND WAKEUP

The life of a bear in a den is supported by feeding on fat reserves accumulated in autumn. The processes occurring in a sleeping bear are similar to those occurring in the body of a starving person, but in a bear they are much more rational. Despite the long immobility in the den, the strength of the bones does not decrease. The brain cells of a bear during winter sleep are in oxygen starvation mode for five months, but do not die, although blood enters the brain 90% less than usual.

Scientists suggest that the process of obesity and moderate weight loss in bears is controlled by a special hormone that comes from the hypothalamus every autumn. After hibernation, the bear completely retains its muscles and does not feel hunger for another two weeks. This explains his playful mood after leaving the den and aimless vagrancy in the habitat.

In Kamchatka, bears leave their dens from the third decade of March to the end of the first decade of June. As a rule, large males of mature and middle age are the first to leave the dens. Then the mass exit begins, and together with the males, single females and young females of the first mating spring, family groups of quadruplets (three-year-olds), tretyakov (two-year-olds) and second-year-olds (year-olds) rise. The last of the family groups to leave the dens are females with underyearlings.

Bears come out of their dens to the snow, and spring is in the air - during the day the temperature is up to + 4 ° C, at night frosts are up to _6 ° C. Snow is slowly moistened, compacted, structured. Leaving the den, the animal is next to it, if no one interferes with it, for several more days, and at night it can return to the den. The first hauls, as a rule, are located two or three meters from the brow, then the animal begins to retreat 50-100 m. During the day, under the sun, it lies down in the open snow, at night it does not return to the den, but settles on snow hauls. He makes bedding, crushing the tops of alder or cedar branches that have melted out of the snow, or peels off the bark from a tree under which he lies down to rest, or smashes a dry stump into chips and sleeps on its rotten fragments.

After three to five days, the bear leaves the den. The study of traces suggests that in the first two or three days the animal lacks purposeful movements. It is like walking freely for the pleasure of moving. Contrary to the general idea that the movement should be directed to the places where food is located, the animals roam rather erratically. Their traces are found both in the middle mountains and on the slopes of hills, up to 1000 m and above sea level, and in the coastal forest zone, and along the ocean coast. In the area of ​​the birch forest, the bear, idly moving, destroys three or four dry trees on two or three kilometers of the way, but not to warm the bed, but to gaming fun, from an excess of strength and desire to move. The need for the game in the post-berth period is higher than in other periods. Free roaming is ordered by the end of May, and the animals gradually focus on the first thawed patches with grass seedlings, on the sunny slopes of ravines, on the banks of ice-free rivers and streams, and those who have reached sea ​​coast, - at coastline ocean.

The early spring feeding period begins, meager in terms of the amount of food, "hungry", in our opinion, but in fact - completely normal for the animal. The secret is in the so-called endogenous nutrition - the use of fat reserves accumulated since autumn, when the amount of fattening food consumed exceeded daily allowance 3-4 times. The beast was forced to gorge himself on foodless winter and spring days and even for the summer, since the nutritional value of herbaceous vegetation is low. By the end of the summer season, the bears completely lose their fat reserves, and those who did not have enough of them begin to lose muscle mass as well.

LYINGS

During the active period of the annual cycle, for rest at night or during the day, the bear uses haulouts - depressions in the ground (in the spring, after leaving the den, the haulouts are made in the snow). In summer, the bear digs beds in the ground or uses others. In autumn, at the first frosts, ground beds are insulated with bedding of dry grass stalks. Such beds are called nesting. As the night temperature drops, the amount of bedding in the haul increases and the hauls themselves look like huge nests on the ground. To collect the litter, the animal makes scrapes with its claws, then with one paw, then with the other, alternately, raking up small piles of dry grassy stems in one place. Then he moves one or two steps forward and picks up piles again. Thus, the animal walks for 5-10 m, then moves back, raking the prepared heaps of stems under it with a roller. The roller rolls into a bed and again begins to rake the piles, moving forward. The stems of some herbs, such as reed grass, are very strong, and the bear does not always succeed in scratching the desired bunch. Then he helps himself with his mouth: he tilts the stems to the side, bites them with his teeth, rakes them into a bunch and moves on. Rolling up 20-30 rollers, he fills up the ground bed with a huge heap of dry grass, then climbs on top of it and rakes a hole in the center with a diameter of about a meter and a depth of up to 50 cm. up to 2-2.5 m. The bear obviously does not need sides of such a width. Apparently, when collecting building materials, he does not measure its volume with own body. Such a bed is used for several days - before rains or wet snowfalls; the bear leaves it as soon as the bedding freezes. Such huge haul-outs are made by only one large male on Lake Lesnoy. The thickness of the litter at the bottom of the ground bed is compressed to 10-20 cm. In nesting beds built in autumn, the litter is different: from reed grass, sholomainik, fallen leaves, destroyed dry stumps. When the grasses go under the snow, the bear uses ground beds in the thickets of alders. He clears them of snow and lays down on a thin layer of peat humus.

In the spring, after leaving the den, the bear makes bedding from branches of alder or elfin cedar, but more often uses dry birch trunks, breaking them into chips and scraping dust out of them with its claws. In the Valley of Geysers, bears have adapted to bask in early spring, in night frosts, in beds dug in warm soil. In summer and early autumn, bears make opposite demands on their beds - they should not keep warm, but take away its excess, that is, be cool and damp. To do this, the animals make them deeper and wider - up to 1.5 m wide and up to 0.5 m deep. Animals dig such lairs in damp places, not far from water, in dense tall grass shaded by trees, or in clumps of olshin, in damp soil.

Normal freshly dug ground beds are on average 80-80-20 cm in size, rarely up to a meter wide. Over time, other bears expand and deepen them. The average width of such beds is from 100 to 120 cm, and the depth is 20-30 cm. The question arises, how can an animal up to two meters long, with a huge body volume, fit in such a small bed? He uses it only as a "chair" in which he places his butt and part of his belly. And the upper half rests on the side of the bed.

WATER

The bear is inseparable from water. In summer, water, snowfields and damp soil are essential components comfortable conditions. They perform a thermoregulatory function. In the habitat area, the beast knows all its baths. "Own" is a misnomer. Baths in the form of small lakes, pits filled with water, streams and rivers are common to all bears. In summer or autumn, after a long grazing under the sun, the beast goes to a watering place and immediately immerses its body in water up to its ears. It can take a bath for 10-15 minutes, and then climbs into the dense thickets of olshin and rests in deep, damp beds.

All the bears grazing in the summer on the grate meadows along the surf line constantly bathe in the ocean. They lay down on the surf line, head to the shore, and lie for 10-20 minutes, washed by the oncoming waves. Then, moving away to 15-20 m, the animal digs a deep damp bed in the sand and lies down in it to rest.

At the end of May, at temperatures from +5 to +10°C, the bears lie in the snow for 5-6 hours, waddling from side to side. In the mountains in June-July, bears use both snowfields and streams for cooling. They do not visit warm mineral springs: warm water bear is not attracted.

The bear does not drink sea water, although it can fish in it, opposite the mouth of spawning rivers, while some part of the salt water falls into its mouth. But when spawning capelin, the bear prefers to collect it, thrown out by the waves, on the shore.

If the bear stopped in the river while catching fish and, plunging its muzzle into the water up to the very eyes, draws water into itself, for 5-10 seconds, making five to seven intervals of 10-15 seconds, then it has finished fishing and will now go out on rest. After resting on the shore for about an hour, the bear begins to feel thirsty again. Even if the river is closer than a swampy puddle, he prefers to drink from the puddle. And if, after resting on the shore in late autumn and winter periods he goes to drink to the river, then he tries not to go into the water, but to drink, kneeling down, barely reaching the water with his muzzle. When he is too lazy to go to the river, he eats snow. Having drunk, he returns to the bed or can lie down right there, on the shore, and watch the river, looking for fish with his eyes.

SNOW AND BEAR

The bear is born under the snow, leaves the den in the snow, in some cases uses it in the summer and lies in the den under the snow new winter. In autumn, snow covers the berry tundra, cranberry swamps and elfin cedar, finally depriving the bear of plant food.

deep winter snow cover the lair, insulate the ceiling and seal the forehead. In alder dwarf elfin, the brows are most often covered with branches bent down under the weight of snow. Rumors that the bear plugs the inlet from the inside with moss or dry grass for the winter is another common myth. In the thickness of the snow, there must be a hole from the forehead to the surface of the snow - it performs the function of a ventilation pipe for thermoregulation and gas exchange in the den.

Coming out of the den, the bear finds himself on the snow, but not on the fluffy and friable one that accompanied him to the den, but on dense snow crust. Morning crust in late April - early May looks like white asphalt. The crust of soldered firn grains can reach a thickness of 5-10 cm. Both a man and a bear walk freely on such an crust. 2-3 hours after sunrise, ice spikes are destroyed. The animal begins to sink down by 10-30 cm, and sometimes down to its belly. To save energy, he prefers to move along the holes of his own or other people's tracks.

PAWS SUCKING

The sucking reflex in cubs separated from their mother in the third or fourth month of life and growing up in a single family group persists until the age of three. The cubs suck each other's fur on their backs and sides with the same rumbling with which they suck at their mother's breasts. Since they do not receive food reinforcement, the process itself is important for them. It is possible that wool sucking is a factor in closer communication with each other and explains family affection before the breakup of the family. The bear cub, left alone, prompted by the instinct of sucking, diligently sucks the clawed fingers of its front paw. This continues until the age of three. This is where, apparently, there is an opinion that a bear in a den sucks its paw.

TABLECLOTH-SELF-BRAND

The bearish "table" in autumn is like a self-assembled tablecloth. Bear feast begins in August and ends in October. During this period, on the berry tundras, shiksha and blueberries, as well as honeysuckle, lingonberries, princeberries, and junipers ripen. On the tundra of the Tikhaya River, up to 25 bears gather simultaneously at one "table" with an area of ​​6 km2. At the end of August, mountain ash ripens in the forest. In October, you can pick cranberries in the swamps. Fish enter the rivers. Bears meet her on the rifts, on the shallows, eat up in the first two weeks, and then eat only delicacies - caviar and brain cartilage. Having eaten fish, they go "by the berries", having eaten berries, they go after the fish. From the abundance of energy-intensive food quickly grow fat.

At the end of October, the self-assembled tablecloth "fades", the bears lose interest in it and, tired after half a year of continuous "work", migrate to rest. Ahead - again a dream in a lair.

Hibernation at the bears

We all love animals since childhood. The bear is no exception. This animal has always bribed with its clumsiness and pretty appearance. The bear became the hero of Russian fairy tales and has always remained a symbol of Rus'. This beast has an impressive size and very thick fur. This animal is always associated with hibernation. It's hard to believe, but the bear really spends a third of his life in a dream. When children ask about the reason for such behavior, it is sometimes difficult for us to answer the simple question “why does the bear sleep in winter?”. The explanation for this phenomenon is very simple.

As you know, bears are omnivorous animals, in other words, they consume both animal and healthy plant foods in their diet. Winter hibernation always falls on the cold season, when nature goes into an economical mode and there is practically no plant food for the bear. Certainly? this animal could, with grief, eat only animals, but they are not so easy to catch.

Causes of hibernation in bears

Average weight bear is half a ton. These are very impressive dimensions. The clumsiness of a bear limits him in movement, it is sometimes incredibly difficult for him to catch a hare or other animal. You can try to find vegetation. But in winter, it practically does not remain, and therefore the bear has to choose a sleep mode. Why the bear sleeps in winter is explained in detail in popular science magazines. This is the so-called protective mode, which allows him to save his life and not die from the cold.

Then you may have a completely logical question why the bear sleeps in winter, while other animals do not. Everything is quite simple. As they say, he can afford it. for the summer and early autumn able to accumulate a huge amount of subcutaneous fat, which will be his salvation from hunger in sleep mode. Since it is very cold in winter, energy consumption increases several times. The bear cannot afford such a luxury. His fat is not enough for an active lifestyle, and therefore hibernation is the only correct solution in this situation.

Bears sleep in winter, a video that confirms this can be found in any nature program. It is worth saying a few words about hibernation itself. By its nature, this is a unique process that allows the animal to survive in the harsh conditions of winter. Sometimes it seems so incredible that it's even hard to believe. It’s worth starting with the fact that hibernation is a certain mode of existence, which is familiar to a bear. Hibernation can be delayed even for six months. But how to survive during this time and not die of hunger. Everything is very simple.

Features of hibernation in bears

Bears sleep in the winter in the video, you can see how the dormant animal just lies. But in fact, this is a very complex biochemical process in which the functioning of all the vital organs of the animal slows down to such a state that one might think that the animal is no longer breathing. This is the so-called power saving mode. This is the only chance for the bear to survive the hungry winter. His breathing is very slow.

In order for all organs to continue to work, fat is used as energy. For hibernation, an animal can spend half its weight. It could be 200 kg. Sufficiently large losses, which over the summer will again be replenished with interest. Often during hibernation bear cubs are born. They are born in a litter. Usually there are several. The most interesting thing is that their weight is so small compared to adult that it is difficult to believe in their ability to survive.

The average weight of a bear cub is about 200 g. You know how bears sleep in winter, but how cubs manage to survive in winter is not yet known. The answer to this question is the natural feeding of offspring of mammals. Just like humans, teddy bears feed on their mother's milk. It is so fat that it guarantees its survival in the winter.
In popular science magazines, you can see how a bear sleeps in winter, it is very risky to take such photos, because, despite the hibernation of the animal, his sleep is very sensitive.

There are cases when packs of animals woke up a bear, and he could no longer fall into his natural state in winter - hibernation. For a bear, this is very bad. He cannot feed himself. There is very little food in the forest and therefore it begins to devastate the villages. before falling into hibernation, the animal carefully equips its lair. This is very important, since he will have to exist in it for half a year.

Very wonderful animal bear

A bear is a very large animal and therefore, when you see him for a walk with your offspring. It pays to be extremely careful. The she-bear reacts very sharply to people, especially when her weak offspring are nearby, so an attack can become a defensive reaction and then you will not have a chance to survive, you should know that an attack on a person by a bear is in most cases the fault of a person.

The animal is simply protecting its offspring. This is an unconditioned reflex. The bear is main character numerous fairy tales, films and legends. It is customary to depict this animal, paw sucking. Not everyone can answer with complete certainty whether such behavior is really observed for the specified animal. In fact, this is so, but the explanation for this behavior lies in the fact that upper layer the animal's paws are very rough.

Why does a bear suck its paw?

For a bear, the process of molting is accompanied by itching, and therefore sometimes he simply gnaws the skin on his paw, and from the outside it looks like he is sucking it. It is worth saying a few more words about hibernation. You should be aware that not all bear species hibernate. by the most beautiful view bears have always been considered polar bear. It has snow-white fur, which perfectly camouflages it under White snow, representatives of this species can do without hibernation, but this applies only to males. The females still go into hibernation.

This is due to the fact that they are responsible for caring for offspring. She-bears must give fat milk to cubs, only then they will be able to survive harsh winter. That's the only reason they hibernate. Male polar bears hibernate well, while eating fish. This is an excellent diet for this animal. Bears are unique animals. This is the most popular animal found in Russian folk art.

The song bear sleeps in winter is a work that has long been loved by everyone. The lyrics of the song can be found online. This great option for karaoke performance. No one will deny that a bear is a very beautiful animal, which sometimes itself needs protection from human beings from extermination by poachers. You should always remember that at the moment of hibernation this animal is most vulnerable, so you can not use it and kill a defenseless animal. Love nature and she will love you back.

Video

For those who have wings, it's good - they flew away and that's it. well and brown bear through bowls and wild forest do not get to places where the climate is warmer.

And he finds a pretty practical solution. In the summer, the bear eats off, then to hibernate until the very spring. But not everything is as simple as it might seem at first glance. Imagine what you would look like if you didn’t drink and eat for six months. Let's get acquainted with some of the amazing processes that occur in the body of a bear during hibernation.

busy summer

To prepare for the semi-annual "fasting", the she-bear needs to make energy reserves. So she doesn't worry about her figure. Its main goal is to accumulate more subcutaneous fat (in some places its thickness reaches eight centimeters). Although she likes sweet berries the most, she is not picky about food. She eats everything: roots, small mammals, fish and ants. By autumn, she can gain weight up to 130-160 kilograms, a third of which is fat. (The weight of a male can reach up to 300 kilograms.) Before plunging into the world of dreams, she stops eating and frees her intestines. For the next six months, she does not eat anything, does not urinate or defecate.

Bears choose a place for a den in a cave, an abandoned anthill or a depression under the roots of trees. The main thing is that it was quiet there and no one disturbed the sweet dream. Bears collect fir branches, moss, peat and other materials to make a warm and cozy bed. The lair is not much larger than the massive body of a bear. When winter comes, snow will cover the lair and only a careful observer will be able to see the hole through which air enters.

hibernation

Some small mammals, for example hedgehogs, the bats and dormouse, fall into the real hibernation, that is, spend most of the winter in a state similar to death. Their body temperature is approaching the temperature environment. But the bear's body temperature drops only 5 degrees Celsius, so his sleep is not that deep. "You can't say that a bear 'sleeps without its hind legs'. A bear raises its head and rolls from side to side almost every day," says Raimo Hissa, a professor at the University of Oulu in Finland, who has devoted many years to studying bear hibernation. Yet the bear rarely goes out from her lair in the middle of winter. During hibernation, the animal's body works "in economy mode. The heart rate drops to 10 beats per minute, and the metabolic process slows down. When the bear sleeps sweetly, fats begin to be burned in her body. Fatty tissues are broken down by enzymes and supply the animal's body with the calories and water it needs.Even though the life-sustaining processes in the body are slowing down, a certain amount of waste is produced as a result of metabolism.How can a bear get rid of them and still keep her den clean?Instead of removing waste the body processes them!

Professor Hissa explains: “Urea from the kidneys and Bladder reabsorbed into the blood and transported circulatory system to the intestine, where it is hydrolyzed by bacteria into ammonia. Even more surprising is that this ammonia goes back to the liver, where it is involved in the formation of new amino acids that form the basis of proteins. Turning waste products into Construction Materials, the bear's body feeds itself during a long period of hibernation!

In the old days, people hunted bears sleeping in dens. Sleepy Toptygin became easy prey. First, hunters on skis found a lair, then surrounded it. After that, the bear was awakened and killed. Today, winter bear hunting is considered cruel and banned in most of Europe.

Studying hibernation of bears

The department of zoology at the University of Oulu has been researching the physiological processes by which animals adapt to the cold for several years. brown bears began research in 1988, and in total over the years, observation was carried out on 20 individuals. A special lair was created for them in the zoological garden of the university. To measure body temperature, study metabolism, vital activity, as well as changes that occur during hibernation in the blood and hormones, scientists used computers, video cameras, and did laboratory tests. Biologists collaborated with specialists from other universities, even Japanese ones. They hope that the results of the research will be useful for solving problems related to human psychology.

New life

The bear sleeps all winter, turning from side to side, but an important event takes place in the life of the bear. Bears mate in early summer, but the fertilized cells inside the body of the expectant mother do not develop until the bear goes into hibernation. Then the embryos attach to the wall of the uterus and begin to grow. After only two months (in December or January), the body temperature of future mother rises a little, and she gives birth to two or three cubs. After that, her body temperature drops again, although it does not become as low as before childbirth. Daddy bear does not see how his children are born. But the sight of newborns would probably disappoint him. It would be difficult for a huge dad to recognize these tiny creatures weighing less than 350 grams as his offspring.

The she-bear feeds the cubs with nutritious milk, this depletes her already weakened vitality. The cubs grow quickly, by spring they become fluffy and already weigh about five kilograms. And this means that in the small "apartment" of the she-bear there is a revival.

Spring

March. Cold winter passed, the snow is melting, the birds are returning from the south. At the end of the month, male bears crawl out of their lairs. But the female bears remain in their hiding place for several more weeks, perhaps because the cubs take a lot of strength from them.

After a long hibernation, a well-fed bear leaves skin and bones. The snow melted, and her fat melted with it. For all that, the she-bear is surprisingly mobile - no bedsores, cramps or osteoporosis. Some time after leaving the den, she cleans the intestines. Bears usually start eating only two or three weeks after waking up, as the body does not immediately get used to the new conditions. But then they wake up remarkable appetite. But since nature itself has recently awakened from its winter sleep, at first there is not much food in the forest. Bears chew grubs and bugs, eat old corpses, and sometimes even hunt reindeer.

The care of raising cubs falls on the shoulders of the she-bear, and she protects her cubs like the apple of her eye. An ancient proverb says: “It is better for a man to meet a she-bear without children than a fool with his foolishness” (Proverbs 17:12). In other words, it is better not to meet with either one or the other. “A mother bear has a lot to worry about. If a male bear approaches, she immediately forces the cubs to climb the tree. The point is that the male can harm them even if he is their father,” Hissa explains.

The cubs spend another winter in the den with their mother. Well, next year they have to look for their own lair, as the she-bear will have new tiny babies.

We already know a lot about the complex and unusual phenomenon of hibernation in bears, but much remains a mystery. For example, why does a bear get sleepy in autumn and why does he lose his appetite? Why doesn't he get osteoporosis? Revealing bearish secrets is not easy, and understandably so. Everyone has their own secrets!

Up to 3 meters tall, up to 1000 kilograms of weight - bears can have such parameters, depending on the subspecies. A powerful body, a massive head, claws - hardly anyone dreams of meeting such a one-on-one, so it’s worth going into the forest where this representative of predators is unlikely to be found.

The second option is to go there in winter, when the bears hibernate. But at the same time, you need to remember that not all bears go to the den in cold weather. Those representatives of formidable predators that live in more warm countries, are quite capable of existing without seasonal sleep. Although the same polar bears, which do not live in hot latitudes, also do not hibernate. The exception is their lactating or brooding females. Everything has an explanation.

What is bear hibernation?

WITH scientific point vision hibernation bear is not a complete dream. When an animal lies in a den, its metabolic processes slow down. At the slightest danger, the animal quickly wakes up. The bear's body temperature drops by only a few degrees - from 38 to 31-34. The state of sleep is preceded by the appearance of lethargy, slowing down of movement, and apathy in predators. This, on an instinctive level, makes you look for a place to build a lair.

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During hibernation, the bear does not defecate or urinate: waste products are processed into proteins, which are so necessary for its existence. The body is completely rebuilt to a new mode. Sleep duration depends on natural conditions and accumulated nutrients and ranges from 2.5 months to six months. During this time, the animal loses about 50% of its mass.

Den, or sleeping room for a bear

In order for the clubfoot to hibernate, two conditions are necessary: ​​a sufficient accumulation of subcutaneous fat and an equipped lair. The bedchamber of the animal is a chamber approximately 1.0-1.2 meters high and 1.6-1.8 meters long, and the entrance corridor reaches 2.5-3 meters. Interestingly, if you wake up a predator in winter, then it will not always return to its lair. If for some reason she has become unsuitable for sleeping, the bear goes to look for another.

Causes of hibernation

As mentioned above, this type of mammal belongs to animals with large dimensions. To feed themselves, they need a lot of food. These predators are omnivorous, but some prefer animal food, someone - vegetable. In the cold season, it becomes difficult to get a second one, and to hold out for a long time only on eating other living creatures for bears is difficult. The lack of the opportunity to eat normally and leads to the fact that they hibernate.

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Polar bears having no problems with subsistence all year round, because their diet is seal meat and fish, it is for this reason that they do not need long sleep. Moreover, in winter they are easier to hunt on hard ice. But polar bears also sleep. On the move and more sensitively and for a short time, in the spring-winter period.

Their brown relatives, due to lack of food, hibernate. Sleep provides oxygen savings in the den, as well as the consumption of nutrients that animals accumulate during the period of activity. What prevents them from stocking up plenty of acorns, roots, nuts and other food is unknown.

It is also difficult for bears to move to warmer climes: they are sedentary, migrating only when they need to find new places to eat. That's all together and forces us to look for a different way to survive in a cold and hungry time.