Bert Willaert,Bert Willaert / Portrait of a Darwin's Frog (Rhinoderma darwinii) Chile, Vulnerable species

Joao Burini / Frog (Cycloramphus acangatan) vulnerable frog species. South-east Atlantic forest, Tapirai, Sao Paulo, Brazil.

Bert Willaert / Male green Darwin's Frog (Rhinoderma darwinii) with young in vocal pouch, Chile, December 2012, Vulnerable species

Mark Moffett / Military River Frog (Thoropa miliaris) the only frog in the world to hunt in tide-pools, Atlantic Forest, near Sao Paulo, Brazil

Mark Moffett / Warty Tree Toad (Hylodes asper) pair courting on a log near stream, preparing to leap into the water and lay eggs, Atlantic Forest, Brazil

Mark Moffett / Warty Tree Toad (Hylodes asper) repeatedly kicks its leg right and left to mark its streamside territory to attract mates, Atlantic Forest, Brazil, sequence 2 of 2

Mark Moffett / Military River Frog (Thoropa miliaris) the only frog in the world to hunt in tide-pools, observed by biologist Richardo Sowaya Atlantic Forest, near Sao Paulo, Brazil

Mark Moffett / Warty Tree Toad (Hylodes asper) repeatedly kicks its leg right and left to mark its streamside territory and attract mates, Atlantic Forest, Brazil, sequence 1 of 2

Joel Sartore / Photo Ark / Darwin's frog (Rhinoderma darwinii) breathing close up, Zoologico Nacional de Chile. Endangered. Captive.

Joel Sartore / Photo Ark / Darwin's frog (Rhinoderma darwinii) breathing and opening mouth, Zoologico Nacional de Chile. Endangered. Captive.

Joel Sartore / Photo Ark / Chile mountain false toad (Telmatobufo venustus) breathing, Zoologico Nacional de Chile. Endangered. Captive.