Its heart that in flight contracted a thousand times a minute, slows until its beat is virtually undetectable. Its body temperature falls dramatically, and its breathing seems to cease altogether. [...] It's hibernating; but for a hummingbird, winter comes 365 times a year.

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Quote text and notes from Wikiquote: David Attenborough (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.