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段落1

This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?

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Roosters greet the rising sun with.

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But they also crow at other times.

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So are they responding to the light?

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Or do they simply know that it's morning?

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New research says the latter: roosters crow because of internal time cues.

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The finding is in the journal Current Biology.

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Scientists controlled the light levels in rooster habitats.

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For two weeks, the birds experienced 12 hours of light followed by 12 hours of dim light.

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Consistent with the pre-dawn noises observed in wild fowl, the roosters began to crow about two hours before their rooms lit up.

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Then, for two weeks, the roosters lived in constant dim light.

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Yet they continued to crow about once a day--at intervals of 23.7 hours to be precise.

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Even without morning light, their circadian rhythms told them when dawn should be breaking.

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The birds also crowed in response to sudden light, and to the sounds of other roosters.

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But they were more likely to react when those stimuli occurred near dawn.

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Showing that you can't really keep a rooster in the dark about the time.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.

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