There are recent findings that might suggest that birds do in fact hibernate. One example is of the Common Poorwill, which was found hibernating in 1946 by a professor Edmund Jaeger.
Several birds (such as the hummingbird) can go into torpor, which is a sort of daily hibernation. The bird’s body temperature lowers and the heart rate slows, meaning the bird uses less energy. Birds may have a limited food supply, especially in the winter, so torpor is important for them to stay alive.
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