Fat-tailed dwarf lemurs, the only primate known to hibernate, are waking up after entering this state for the first time in captivity.
This year, the fat-tailed dwarf lemur has gone into true hibernation at the Duke Lemur Center in North Carolina, US - and the findings could be important for humans too.
Hibernation is a fundamental part of many species’ lives, but it rarely happens when animals aren’t in the wild.
Normally, captive dwarf lemurs are fed extra over the summer period to help them bulk out, as they normally would in the wild, to allow them to go into a suspended state of torpor (low heart-rate and body temperature).