Flight performance: Frigatebirds ride high on thermals

  title={Flight performance: Frigatebirds ride high on thermals},
  author={Henri Weimerskirch and Olivier Chastel and Christophe Barbraud and Olivier Tostain},
Aspects of the morphology and life history of frigatebirds verge on the extreme, and how they spend their time at sea has been a mystery until now. Here we use data collected by altimeters and satellite transmitters attached to individual frigatebirds to show that these birds are continuously on the wing, day and night — they fly in a succession of climbs and descents, soaring in circles on thermals to heights of up to 2,500 m and gliding down in the direction of travel. The birds' curious… 
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