Why Do Bears Hibernate

The bear have evolved along time ago and now there is only eight species existing. They evolved from early canids during the late Oligocene and early Miocene, about 25 million years ago. The earliest ancestors where the Dormaalocyon Latouri. An intermediate ancestor was the short faced bear, very similar to the modern day bear. It lived through the pleistocene period. It grew to thirteen feet long and was a herbivore. The ancestors to the modern day bears lived in the same climate and ate the same things. The modern bear contrast from the ancestor because the ancestor was more skinny and was smaller, and it was more cat like. The eight species of bear that still exist. They are the Polar bear, Brown bear, American black bear, Asian

The grizzly sheds the thick part of their coat during the summer. The coat also protects the grizzly bear from insects or any types of bugs. The grizzly bears have a very large home range that they will roam through. The grizzly bear also spend hours of the day walking around, but that is common for grizzly bears. The wear in the temperate rainforest is sunny and sometimes rainy. When the grizzly bear needs to move quickly through their habitat it can be done so at a speed of 30 miles per hour. The mating season for grizzly bears start in mid-May it continues until the middle of July. Grizzly bears can live in the wild up to 30years. They can also die at the age of 25. Grizzly bears can be found in woodlands, forests, alpine meadows and prairies. They prefer to be around streams or rivers. Grizzly bears are mainly solitary, except for mothers and their cubs. Grizzly are known to meet up at a river or a stream. Grizzly bears are also very strong swimmers. Grizzly bears use sound, movement, and smells to communicate with each other. Grizzly bears happen to groan and moan to get each others attention. Grizzly bears also rub their bodies on trees so they scratch their self. Throughout the summer grizzlies build up fat by eating as much

Unfortunately, about twelve bears are killed annually while traveling to hibernation spots for the winter. After the bear comes out of hibernation, they will eat anything for food, because they are so extraordinarily hungry. (animals) The bear's hibernation spot depends on the weather, it can be under tree roots, in a cave, or even in a hollow tree based on how

Rattlesnakes are even known to move around during extended warm periods during winter months, especially if they hole up in a stump or other location that can be warmed easily by sunshine. Snakes do not actually hibernate, rather they become less active during cold weather. It is called

The female bear will stay with her cubs for one and a half to two years. The mothers will teach cubs important life survival skills and then leave them to have another litter of cubs (American Black Bear, 2015). Males will leave hibernation early to search for a mating partner, while females do not. Another way males and females are different is there physical appearance. Male skulls are 10% larger than females (Ballard,

How much do you absolutely perceive about bears? In this article I will educate you all there is to know about bears hibernating, and if they can cure human illnesses. My topics are, Heart, Bones, and muscle illness.

Black Bears are not hibernators, but they do become a lot less active and go into a dormant state during the winter months. This is referred to Seasonal Lethargy. Black bears enter their dens in October and November. Before to that time, they can put on up to 30 pounds of body fat to get them through the seven months during which they fast. Winter dormancy in Black Bears typically lasts 3–5 months. They spend their time

Some of the large, main carnivores of the forest include the Siberian Tiger, lynx and bobcat. Some of the smaller herbivores in the forest include the arboreal porcupine and the terrestrial show shoe hare (w3.marietta.edu). Bird inhabit the forest in the summer; 1 in 3 birds in the United States and Canada spend their breeding seasons in the boreal forest (Berg, 2012). In order to survive in the winter, some animals burrow beneath the snow and forage for their food in tunnels in the forest floor. Others hibernate throughout that cold season. Insects are more prevalent during the summer months when plant growth is at its peak, but it dies down during the winter (w3.marietta.edu).

The water bears live all over the world from the deepest sea to the Himalayas. Most of the water bears live in fresh water, often in wet or moist habitats that are subject to frequent periods of drying and then rewetting such as the moss on a roof or algae in the gutters. Other areas include hot springs, glaciers, lichens, leaf-litters. Their ability to form a “tun” allows them to be blown around the world by the wind. The water bears enter a cryptobiotic phase in environments with intermittent moisture that allows them to survive conditions such as drought, low oxygen, salinity changes, or extreme temperatures.

During the warmer seasons bears go on a feeding frenzy. They eat an abundant of food to gain about 5 inches of fat that will be used later during hibernation when the temperature drops. Normally a bear’s heart beats 40 times a minute when it is sleeping but during hibernation the heart beats will slow down to 8 beats per minute. The body temperature of the bear will drop about 9 degrees lower and therefore results in a hold in the body’s metabolic functions. The bear will feed from the fat reserves that it put on.

The average temperature of a polar bear is 37°C, they are able to maintain this temperature by the thick  layer of fur they have, they also have a tough hide and a insulating fat layer. This insulation is able to keep the polar bear warm in temperatures that drop to -37°C. However as polar bears have a very thick layer of fat they can overheat and can die because of this, so the way they are able to keep cool is they do not travel for too long at a slow pace. Doing this stops the polar bear from overheating. If there is excess heat it will be released through the nose, ears, muzzle, footpads, thighs and shoulders as these areas do not have any fur covering it and these areas they have blood vessels which are located close to the skin. Another thing they can do to cool down

Asiatic black bears are primarily nocturnal feeders and sleep in a tree hole or in a cave during the daytime, but they do sometimes forage diurnally. During the autumn, their nocturnal activity increases("Asiatic Black Bears", 2004). They shift their ranges in early autumn in order to obtain native broadleaved

The polar bear is the largest known land animal that eats meat. With black skin, and light reflecting fur, it is capable of a lot of things with its adaptations. Adult polar bears can weigh over 1,400 lbs and can grow up to 10 feet tall. With this, they can use their unbelievable strength to catch prey like sea lions, walruses, etc. Polar bears have adapted to swim up to 100 miles (6 miles an hour). Though, you may think they are cold most of the time; they’re not. Polar bears tend to overheat more than getting too

Animals of the tundra have had to adapt to the long cold winters and to having to raise their young quickly in the summer. Some other adaptations of animals include thick insulating cover of feathers or fur; large, compact bodies; pelage and plumage that turns white in the winter and brown in the summer; the ability to accumulate thick deposits of fat during the short growing season; hibernation; and migration. Some of the animals that are found living in the tundra are lemmings, voles, caribou, artic hares, squirrels, artic foxes, wolves, polar bear, ravens, snow buntings, falcons, loons, ravens, sandpipers, terns, snow birds, mosquitoes, flies, moths, grasshoppers, black flies, artic bumble bees, cod, flatfish, salmon, and trout. Some of these animals are shared with other neighboring biomes but some are only home to the tundra. The tundra is the simplest biome in terms of species composition and food chain. The neighboring biome of the tundra is the boreal forest (taiga).

Not all animals migrate during the winter; such as: birds,fish, whales and sea turtles. On the other hand, most mammals, and some reptiles like the tortoise prefer to sleep during the whole winter, which will usually last up to five to seven months. These months vary from animal to animal; this is called hibernation. Ubeda claims in his article that, hibernation is a deep sleep in which an animal's body temperature drops to just above the temperature of the outside world to conserve as much energy as possible (Ubeda). Hibernation by larger animals, such as, the bear or mountain lion usually occurs during the winter in large dens. On the other hand, if the animal is smaller like a squirrel or a rabbit, hibernation will take place in a small hole or a tree. One reason why hibernation occurs is because food is scarce and harder to achieve, so animals need to conserve all their energy. In Grabianowski’s article, he claims that an animal starts hibernation by slowing their heart rate down (which allows their body temperature to drop) (Grabianowski).