The Eiffinger's tree frog (Kurixalus eiffingeri), found on Ishigaki and Iriomote islands in Japan, has a unique biological adaptation: its tadpoles do not defecate during their early developmental ...

A mother in Rockville, Maryland, bought a tadpole for her daughter in 1989. The frog it became, Gilly, is still going strong, causing an inquiry into the lifespan of a pet frog is questioned.