In the north part of black bear’s range, most of them are______. [originaltext]

American black bears appear in a variety of colors despite their name. In the eastern part of their range, most of them are brown, red, or even yellow. (17)To the north, the black bear is actually gray or white in color. Even in the same family, both brown and black color bears may be born. (18) Black bears are the smallest of all American bears, ranging in length from five to six feet, weighing from three hundred to five hundred pounds. Their eyes and ears are small and their eyesight and hearing are not as good as their sense of smell. Like all bears, the black bear is timid, clumsy, and rarely dangerous, (19)but if attacked, most can climb trees and run at great speeds. When angry or frightened, it is a dangerous enemy. Black bears feed on leaves, plants, fruits, berries, insects, fish, and even larger animals. One of the most interesting characteristics of bears, including the black bear, is their winter sleep. (20) Unlike other woodland animals, bears do not actually sleep in winter. Although the bear does not live on body fat during the winter months, its temperature remains almost normal, and it breathes regularly four or five times per minute.