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The Common Swift - Anything but Ordinary
http://blogs.bu.edu/bioaerial2012/2012/10/14/the-common-swift-anything-but-ordinary/
  Publisher:  BU Date Written:  14/10/2012 Year Published:  2012    Resource Type:  Article
  Most adult swifts spend almost their entire lives in the air. Except for breeding, adult swifts will typically eat, drink, sleep, and mate while flying. During nesting season, swifts are known to fly at least 560 miles per day. Many times, large groups of swifts  up to 2000 birds  will form feeding parties. These feeding parties position themselves over wetlands  lakes, river deltas, flooded areas  where small flying insects are commonly found. One of the ways in which swifts are able to fly for such long distances without landing is that they have the ability to sleep while in flight. In order to be able to sleep while flying, swifts can enter a state called unihemispheric slow-wave sleep.
 
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