Скачать или смотреть Why Hummingbirds “Snore” at Night 😴

Hummingbirds have the highest metabolism of any warm-blooded animal, which lets them hover but makes sleeping dangerous. They burn energy so fast they are only hours from starvation, so at night they enter torpor, a deep, temporary coma. Their body temperature drops sharply and their heart rate falls from about 1,200 beats per minute to as low as 50. They become so still they can look dead.

The “snoring” sound people record happens when the bird wakes up. As it warms itself, it gulps oxygen and shivers, creating squeaky, whistling noises. It takes around twenty minutes before it can fly again.

This sound is actually a survival miracle. Without torpor, a hummingbird could lose up to ten percent of its body weight overnight and not survive. That tiny whistle is the sound of its body switching back on for another day of flight and feeding.

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