This is a condition of decreased body temperature and low energy use in an animal. An animal that is in torpor is not asleep. It’s torpid. When an animal sleeps, its body temperature and the energy its body uses remain relatively high. But when an animal enters torpor, these plummet. Torpid animals can have extremely low body temperatures and use very little energy. It’s a good way for an animal to survive a time when food may be scarce.
Torpor doesn’t have to last a long time. Some birds, rodents and bats do it daily. Other mammals go into long-term torpor for days, weeks or months.