In Animals, What is the Difference Between Hibernation, Hibernation, and Torpor?

Biting cold, masses of snow and long winter nights: feathered animals head south, other four-legged creatures get cold feet, turn their backs on the world and retreat into their burrows for weeks. They simply sleep through the uncomfortable season, entrenched and well-fed. But not all hibernation is the same. Mammals in the wild, like birds, … In Animals, What is the Difference Between Hibernation, Hibernation, and Torpor?