Torpor, sometimes called temporary hibernation's a (usually short-term) state of decreased physiological activity in an animal, usually characterized by a reduced body temperature and rate of metabolism. Animals that go through torpor include birds (even tiny hummingbirds, notably Cypselomorphae) and some mammals such as mice, and bats. During the active part of their day, these animals maintain normal body temperature and activity levels, but their temperature drops during a portion of the day… (More on Torpor)