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 Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X 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.