Theseus
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Of a bird it means descending rapidly from a height once the decision to land has been made, involving fast side-slipping first one way and then the other. The term is usually applied to geese (Anatidae), whose flocks whiffle spectacularly, especially when wishing to avoid a long, slow descent over an area where wildfowling is practised. It results in an aerial manoeuvre in which a bird flies with its neck twisted 180 degrees and its body upside down in order to achieve a rapid yet controlled descent. See http://www.dailymail.co.uk/news/art...g-gooses-incredible-contortion-slow-down.html.
http://www.youtube.com/watch?v=Z4j1tKVzicU:eek::D
http://www.youtube.com/watch?v=Z4j1tKVzicU:eek::D