The Bushveld rain frog is found in Southern Africa. When threatened, it puffs itself up to ward off potential attackers.
The frogs are sexually dimorphic, and the male is too small to mount the female properly to reproduce. The white secretion you see on the back of the frog is actually an adhesive that holds the male in place during copulation.
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Photo credit: CapeSnakes posted on https://www.facebook.com/ScienceIsSeriouslyAwesome 7/30/13