From Facebook/NaturalSelection on Nov 2/2013
Vietnamese mossy frog (Theloderma corticale) – By living in environments that are tropical and humid, this little frog has evolved a camouflage mechanism (its skin) that allows it to almost fully conceal itself from potential predators and blend in with the surrounding mossy environment. When threatened, it curls up into a ball and plays dead.
An interesting fact:
“Frogs have no hard palate in their mouth. Instead of pushing food to the top of their mouth in order to swallow it, they will pull their eyes down into the roof of their mouth to help force food down their throats.