Once thought to occur only in birds and mammals in the Northern Hemisphere, due to the more pronounced winters, we now know torpor is widespread in small Australian mammals.
Breeding pairs spend a great deal of time roosting together and the male often gently strokes the female with his beak.
Researchers are puzzled by a fungus that is killing millions of bats.
Green iguanas are an invasive species that seem to be spreading and proliferating in Florida. Used to warmer temps, they switch into torpor mode when the mercury drops.
When you're warm and cozy inside, it can be natural to wonder if the animals you see outside your window this winter are doing OK. Don't worry – they're doing better out there than you would.
The European Space Agency is exploring what we can learn from animals about long-term deep sleep.
A new study looking at a long-lived lemur species attributes it to their frequent hibernation-like state. But what lessons can humans learn from this?
It's all about mating success.