Where does this come from, and can I check it?

Entering torpor slows its heart from over a thousand beats a minute. The figure is taken from Audubon, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a animals fact?

Yes. It sits on the Animals shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

A hummingbird can drop its body temperature overnight

Entering torpor slows its heart from over a thousand beats a minute Wing beats reach 50 a second in some species and hovering costs a great deal of energy. At night, when feeding stops, they lower metabolism and body temperature close to the air temperature. They revive within minutes at dawn. It sits in Mondo's animals collection, one of 200 facts that each trace back to the reference below.

Where this comes from

Audubon

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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Nature & Animals trivia

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Some shrews hunt with venomous salivaA bite paralyses insects and small prey for later consumption The brain consumes twenty percent of the body energyDespite comprising two percent of body weight the brain uses massive metabolic fuel The liver performs over five hundred essential body functionsFiltering blood detoxifying chemicals and synthesising vital proteins The thyroid gland regulates overall cellular metabolism rateButterfly-shaped neck gland secretes thyroxine to control energy usage Core body temperature drops naturally during night sleepThermoregulatory cooling lowers metabolic rate to conserve resting energy The liver turns nitrogen waste into ureaA five step cycle in liver cells packages ammonia into a safer molecule for excretion

Tags: hummingbirds, torpor, metabolism

A hummingbird can drop its body temperature overnight: the short answers

Where does this come from, and can I check it?: Entering torpor slows its heart from over a thousand beats a minute. The figure is taken from Audubon, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a animals fact?: Yes. It sits on the Animals shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.