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How Musk Ox Make It Through Arctic Nights and Never-Ending Days – The New York Times

Scientists wondered whether animals living above the Arctic Circle had the same circadian rhythms as the rest of us.

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In the distant reaches of northeastern Greenland, musk oxen amble across the tundra, grazing as they go. As Arctic creatures, they need to gather enough energy to make it through cold, dark winters. So when the bright summers come, they eat as if their lives depend on it as in fact they do.
Their lives are so extreme, scientists have wondered: Do they have circadian clocks?
Most creatures on the planet live in lock step with the planets daily cycle of light and dark. Theres a time of day for eating,…

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