Hummingbird's temperature can fall to 3.3C at night to preserve energy

Researchers in Andes find temperature a record for all birds and non-hibernating mammals

Hummingbirds have scooped another record: they are not only tiny but can reach body temperatures below that of any non-hibernating mammal and any other bird.

The hummingbird is among a number of small creatures, including certain bats, that can enter a state known as daily torpor, a phenomenon where they turn down their metabolism and body temperature to save energy.