Researchers have found that ducks and other birds sometimes sleep with one eye open.
When they nap in groups, the ducks on the perimeter keep guard by sleeping with one eye open.
While the other ducks sleep more deeply, those on the outside of the circle also keep one hemisphere of their brain awake, even as they doze, so that predators won’t be able to sneak up on them.
And here’s a short clip of some Yellow Billed Ducks I recently filmed.
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Here’s another Duck video of mine, this time it’s the juvenile White Face Whistling Ducks.