Preening in flight.--So often one does not know what is unusual until someone else says it is. I refer to the publication of a note on a Little Gull (Larus minutus) preening in flight (Brit. Birds, 54: 117}Some attitudes adopted by {left to right) Black-headed Gull {L.arus ridibundus), Swifts {Apus apus) with wings elevated and depressed, and White-winged Black Tern (Chlidionias kucopterus) when p...

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