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Birds can sleep in flight

Researchers have discovered that birds can sleep in flight without colliding with obstacles or falling from the sky. Measuring the brain activity of frigatebirds, the researchers found that they sleep in flight with either one cerebral hemisphere at a time or both hemispheres simultaneously. Frigatebirds are large seabirds that spend weeks flying non-stop over the ocean in search of flying fish and squid driven to the surface by predatory fish and cetaceans. To determine whether and how birds sleep in flight, the researchers needed to record the changes in brain activity and behaviour.

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