More Mammals Are Hiding Their Secret Glow First it was platypuses. Now we may be dealing with glowing Tasmanian devils, echidnas and wombats. Stuffed bare-nosed wombats fluoresce under a black light at the Western Australia Museum. Credit...Western Australia Museum By Cara Giaimo Were platypuses just the beginning? In October, researchers reported that the already perplexing animals fluoresce a psychedelic blue-green color under black light. The species joined a short list of mammals known to do this, including opossums and flying squirrels. Since the study came out, others have begun their own investigations, mostly in Australian mammals. Although results are preliminary, the findings suggest we may have to book a larger venue for the mammal rave.