All birds need to sleep — or at least snooze — sometime during each 24-hour period. And most sleep at night. A bird (such as these Mallard Ducklings) may turn its head around and warm its beak under its shoulder-feathers. Songbirds find a protected perch, sheltered from rain and nighttime predators. Small forest birds often spend the night in tree cavities. Ducks sleep while floating in protected bays.

More info and transcript at BirdNote.org. 

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