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Nonstop Flight: How The Frigatebird Can Soar For Weeks Without Stopping
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Nonstop Flight: How The Frigatebird Can Soar For Weeks Without Stopping

Quote:Frigatebirds, seagoing fliers with a 6-foot wingspan, can stay aloft for weeks at a time, a new study has found. The results paint an astonishing picture of the bird's life, much of which is spent soaring inside the clouds.
Frigatebirds are unique among aquatic birds. Their feathers are not waterproof, so they can't rest on the waves. Males sport a vivid red pouch along their throats that they inflate when trying to attract females. They're known for stealing food from other seabirds.
Since the frigatebird spends most of its life at sea, its habits outside of when it breeds on land aren't well-known — until researchers started tracking them around the Indian Ocean. What the researchers discovered is that the birds' flying ability almost defies belief.
Ornithologist Henri Weimerskirch put satellite tags on a couple of dozen frigatebirds, as well as instruments that measured body functions such as heart rate. When the data started to come in, he could hardly believe how high the birds flew.
"First, we found, 'Whoa, 1,500 meters. Wow. Excellent, fantastique,' " says Weimerskirch, who is with the National Center for Scientific Research in Paris. "And after 2,000, after 3,000, after 4,000 meters — OK, at this altitude they are in freezing conditions, especially surprising for a tropical bird."

https://www.npr.org/sections/thetwo-way/...t-stopping
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