Wednesday, January 30, 2008

roding woodcock eat your heart out....

A species of hummingbird makes a chirping noise with its tail feathers, not its throat, a study using high-speed video has suggested.The exact source of the noise from male Anna's hummingbirds has been the subject of debate among researchers.By using specialised footage, a team of US scientists were able to show that male hummingbirds' tail feathers vibrated during high-speed dives.The findings appear in the Proceedings of the Royal Society B journal.

The loud chirp sound is produced by male Anna's hummingbirds (Calypte anna) as the birds dive towards the ground at speeds that exceed 50mph (80km/h) during their displays for nearby females. (Wonder what the equivalent pound for pound human speed would be?)

see: http://news.bbc.co.uk/1/hi/sci/tech/7216230.stm for detailed report.


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