Cheirogaleus medius it is.It uses a tree-hole as a home for hibernation even when the temperature is 30C outside. Researchers think that it hibernates to avoid the violent swings in temperature that bedevil the tropics during winter days. [Source: Nature 2004, vol.429, p. 825 , the complete run of which we trivia types always have handy Though, coincidentally, this is mentioned in the book 'Moths that Drink Elephants' Tears' by Matt Walker (2006)]