Frog skin is so water permeable that frogs can usually absorb all the moisture they need directly through their skin. The color patterns are ususally designed to allow them to blend in with the background though there are many poisonous species whose skin does the opposite in order to advertise their poisonous nature. They can also act as a kind of reproductive advertising for males, similar to the feathers of a pea cock.

This slide was purchased on Ebay and is part of 100 prepared slides " set B"