Hummingbirds can drop their body temperature below 4°C when they rest

Hummingbirds can enter a hibernation-like state at night, dropping their body temperature to under 4°C in an effort to preserve energy for use during the day.

The birds are among the few animals, including night hawks and some small rodents, that are capable of torpor, in which body function reduces to a bare minimum for a few hours, says Blair Wolf at the University of New Mexico.

Previous studies have found that hummingbirds can drop their body temperature…