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http://www.fitzpatrick.uct.ac.za/sites/default/files/image_tool/images/275/Publications/PDF_Archive/Africa_Birdlife/Volume_Index/Vol2/AB02%282%2932-38.pdf
They do it for warmth!
I think there is a protection element as well, a potential predator would be 'confused' by the choice. Fish do the same when stressed.
(Link edited to remove excess http - Chris)
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Still learning after all these years!
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