Frogs are in danger more from water loss than absorbing too much.

Frogs don't often drink with their mouths, they absorb water through their skin. They have a 'seat pouch', an area on their bellies which is designed for water absorbtion. They absorb through capillary action from water or a moist surface.

Frogs also control water by burrowing and cocoons of shedded skin if in dry conditions.

They can also change the colour of their skin, which changes how much heat they absorb. Bright green is more absorbant then darker greens or browns.

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