Most frogs breathe in oxygen from their skin and through their lungs. However, while a frog is underwater they only breathe through their skin. For example, during hibernation a frog will stay beneath the water or underneath thick mud. Frogs, depending on the type, can stay underwater anywhere from minutes to several months because of the cutaneous gas exchange process which is defined as “the exchange of oxygen and carbon dioxide between skin and environment” (2008, Feder & Burggren). Bullfrogs and green frogs, for example, breathe through their lungs and skin and can stay underwater for a majority of their adult lives. Toad and treefrogs differ, spending their adult lives out of the water.
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