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They are generally diurnal, but may be active during the night (nocturnal) or twilight (crepuscular), particularly around humans. Bears are aided by an excellent sense of smell, and despite their heavy build and awkward gait, they can run quickly and are adept climbers and swimmers. In autumn some bear species forage large amounts of fermented fruits which affects their behaviour.[1] Bears use shelters such as caves and burrows as their dens, which are occupied by most species during the winter for a long period of sleep similar to hibernation.
Polar bears are made for the cold. Their hairs are hollow, making for excellent insulation that is capable of trapping much of their body heat. Only the nose and eyes radiate heat, so they cover them with their paws when they sleep.
The cinnamon bear is very similar in shape and size to the common American black bear. It stands about 3 feet high when on all 4, and it can weigh anywhere from 200 to 600 pounds, depending on food availability. It has a thicker coat of longer and finer hair than the common black bear.

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