Berries and grubs. Just a heads up for those who like hiking in the fall - be careful, don't be too quiet, and carry bear spray. Have it ready to use. Either that, or someone has to come along later and shoot the bear you startled.
No, they do not because they fill up with lots of food for the winter so when they are in sleep all the fat in the bear's body basically consumes all the fat in its body.
Both species don't eat and live off their fat reserves during the winter
During the winter, food is too scarce for brown bears and black bears to survive. Hibernation is a state of extreme sleep where metabolism slows down. This reduces energy use and allows the animal to survive winter on its fat reserves alone.
== == Most bears prepare for hibernation by eating a lot. They gain a lot of weight to sustain lowered metabolic function and minimal function of organs like the heart and breathing during hibernation.
bears need to gather a lot of fat so they eat a lot before the winter then they make a den that might have some leaves and maybe a few berries
The coming of winter and its instincts. Bears' instinct make them hibernate before winter as food is scarce in the winter, so they stock up (eat) a huge quantity of food and doze off for a season.
They eat so much in summer ect. They eat up there body fat in winter
Black bears do not shed their summer coats for a winter color but the fur becomes thicker as fall approaches and the temperature drops. The bears, where winters are harsh, will eat large amounts of food to put on winter fat to carry them through the season when forage is scarce. They will also den up and go into a deep sleep (not hibernation) to conserve energy.
Polar bears have blubber, which is like extra fat, under their fur and that helps to keep them warm during the winter. They also grow out their winter fur coats to keep themselves warm during the winter.
Fat.
Bears in general, need to put on enough body fat during Autumn, so as to survive the winter hibernation.
Yes, fat helps insulate your body. Fat serves for us the same it serves for bears. Bears store up fat, which keeps them warm while they're in hibernation. Fat serves the same purpose for us, but we shouldn't eat nearly as much fat as bears do. Just the right small amount.