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Whiffling
Whiffling is a term used in ornithology to describe the behavior whereby a bird rapidily descends with a zig-zagging, side-slipping motion. Sometimes to whiffle, a bird flies briefly with its body turned upside down but with its neck and head twisted 180 degrees around in a normal position. The aerodynamics which usually give a bird lift during flying are thereby inverted and the bird briefly plummets toward the ground before this is quickly reversed and the bird adopts a normal flying orientation.〔The One Show, BBC TV programme, broadcast 11 February 2013〕 This erratic motion resembles a falling leaf, and is used to avoid avian predators or may be used by geese (family Anatidae) to avoid a long, slow descent over an area where wildfowling is practised.
The behavior is seen in several species including lesser yellowlegs (''Tringa flavipes''), the black-tailed godwit (''Limosa limosa''), the northern lapwing (''Vanellus vanellus''), geese (e.g. pink-footed goose (''Anser brachyrhynchus'')), three species of scoter (''Melanitta''), and other members of the family Anatidae.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Whiffling」の詳細全文を読む
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