Mallards on Ice
Many birds can sleep with one half of their brain while the other half remains awake.
February 9, 2025
We tend to think of being asleep and awake as two distinct states. However, many birds can sleep with one half of their brain while the other half remains awake. In dangerous situations, they can rest with one eye open, keeping one side of their brain alert to detect predators. This adaptation also allows birds to sleep while flying long distances during migration.
This unique behavior, known as unihemispheric sleep, is also seen in aquatic animals like dolphins and seals. According to researchers, it helps them surface for air and regulate their body temperature while they sleep.
iNaturalist Mallard Observations at Anson B.Nixon Park
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About Anson B. Nixon Park
