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They could sleep with one “half” of the brain.
They keep one eye open and “connected” to the awake half.
It can keep the birds going until they return to land.
A study on birds sleeping in flight.
addresses
market
describing
lead
while
natural
easily
to prevent
shaking
To record changes in the animal's brain activity (as they flew for up to10 days and over 3,000 kilometres).
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