At least the birds are only HALF asleep while flying.
Mike
At 10:27 AM 10/28/2016, you wrote:
<http://www.nature.com/articles/ncomms12468>http://www.nature.com/articles/ncomms12468
Fascinating study in Nature which documents how frigatebirds are
able to cross oceans without flapping, using thermals over water, while asleep.
Amazingly they manage to thermal with only one eye open and one
brain hemisphere asleep, which suggests there may be more in common
between glider pilots and frigatebirds than previously thought.
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