By Nick, Evan, and Blaine Adult bears are about 4 feet to 6 feet long. They have a very keen sense of smell and are mainly vegetarians although they will also eat insects, small mammals, and occasionally livestock. During the fall, the females store up lots of fat to live off of while they hibernate. During that time time, they give birth to their cubs. A bear's lifetime can be as long as twenty-five years, but most only live to be around fifteen years old.
Bears are active mostly at night but sometimes travel and feed during the day.