Nebraska's state mammal is the white-tailed deer. Its most notable characteristic is the white hair on the underside of its tail. When frightened it raises its tail, and the white underside signals danger to other deer.
White-tailed deer live singly or in groups of two to three during the spring, and in groups of twenty-five or more during the winter. They eat mainly leaves, twigs, and shrubs, but will also eat acorns, grass, and fungi. White-tailed deer can run up to thirty-five miles per hour, and jump thirty feet horizontally and eight feet vertically. They can live up to sixteen years in the wild, but antler points do not indicate age.