Limosa harlequin frog (Atelopus limosus) baby on a U.S. quarter. Published March 22, 2013 at 1024 × 683 in Rescue Project Successfully Breeds Endangered Frog Species Limosa harlequin frog (Atelopus limosus) baby on a U.S. quarter. (Photo by Brian Gratwicke, Smithsonian Conservation Biology Institute) Tweet Tweet