News Animals A first for mammals: Tropical hibernating By Susan Milius July 20, 2004 at 12:33 pm - More than 2 years ago Share this:Share Share via email (Opens in new window) Email Click to share on Facebook (Opens in new window) Facebook Click to share on Reddit (Opens in new window) Reddit Click to share on X (Opens in new window) X Click to print (Opens in new window) Print Madagascan fat-tailed dwarf lemurs hibernate during the winter, even though daily temperatures often top 30°C (86°F). WINTER HEAT. A Madagascan fat-tailed dwarf lemur can use bad insulation in a tree to its advantage during hibernation. Dausmann The lemurs (Cheirogaleus medius) are the first tropical mammals, and the first primates, found to hibernate, Kathrin H.