Grown females do the same in July. But the young stay active into September and go into hibernation in the fall, when there is less food to be found. The Richardson's ground squirrels save some food and hide it. Black bears will go into their dens in the fall and not come out till spring. The tiny cubs are born during hibernation.
Bears eat and eat in the late summer and fall, so that they can store fat before going to their den.
When they come out in the spring, bears are very thin and very hungry. BATS are hibernators. In the fall large flocks of bats find shelter for the winter. The bats hang upside down and pull their wings and tails close to their bodies to keep warm. Their temperature drops and they seem to be dead.