Hibernating Birds
Historically, Pliny the Elder believed swallows hibernated, and ornithologist Gilbert White pointed to anecdotal evidence in The Natural History of Selborne that indicated as much. Birds typically do not hibernate, instead utilizing torpor. One known exception is the Common Poorwill (Phalaenoptilus nuttallii), first documented by Edmund Jaeger.
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“Fish got to swim, birds got to fly.”
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