SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Treefrog. Close-up of the head of a frog (Eleutherodactylus sp.) showing cryptic camouflage colouration. Eleutherdactylus is typically thought of as the largest vertebrate genus on Earth, with over 700 species, and new ones being discovered almost every year. Many species are commonly known as 'rain frogs' or 'tink frogs' because of their sharp, high-pitched, insect-like calls. This frog's cryptic skin colouration camouflages it against the trees it lives on.
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