How do Reindeer Survive in the Arctic? – BBC News

Reindeer have a body clock, that they seem to be able to switch off and on, according to scientists.
Researchers found that the animals are missing a “circadian clock” that influences processes including the sleep-wake cycle and metabolism.
This enables them to better cope with the extreme Arctic seasons of polar day, when the sun stays up all day, and polar night, when it does not rise.

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