A1 · First steps 78 words · 1 min

This Bird Sleeps While Flying

Frigatebirds fly for many days and sleep only a little.

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A frigatebird can fly for many days. It flies over the open sea. It cannot land on the water. So when does it sleep?

Scientists put small machines on the birds. The birds fly for up to ten days. They sleep while they fly. Half the brain sleeps. One eye stays open.

This is surprising. At sea, birds sleep only forty minutes a day. On land, they sleep more than twelve hours. They rest a lot at home.

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