A frog is a cold-blooded animal. Cold-blooded animals need external warmth to keep warm in winters. When winter sets, frogs hide under rocks, leaves or in a log. Some frogs dive into a pond and bury themselves in the mud. As ponds do not freeze solid, even in harsh winters, frogs also don’t freeze. They also need very little oxygen in the cold. Under the water, frogs absorb the oxygen dissolved in the water through their skin. Hence, they can survive underwater the whole winter season without breathing air. And we hear no croaking of frogs near ponds in winters.