This photo provided by researchers in December 2022 shows a glass frog, strict leaf dwelling frogs, that sleep, forage, fight, mate, and provide (male) parental care on leaves over tropical ...

Nation World Glass act: Scientists reveal secrets of frog transparency These little tropical frogs have a rare talent: They "hide" nearly 90% of their red blood cells in their livers while sleeping.

A species of glass frogs found in South and Central America has the rare ability to turn its transparent appearance on and off.