r/ScienceFacts Behavioral Ecology Dec 29 '23

Biology Eurasian tundra reindeer chew cud and nap to maximize grazing during warmer months. When a reindeer ruminates, its brain wave patterns often resemble those of light sleep. Unlike other animals that hibernate or enter into torpor throughout winter, reindeer seem to relax instead of sleeping more.

https://www.science.org/content/article/reindeer-sleep-just-opportunity-keep-eating
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