Page last updated at 10:12 GMT, Wednesday, 2 September 2009 11:12 UK

Pigeons' wings sound the alarm


When a crested pigeon is startled into flight its wings produce a whistling sound which serves as an alarm call.

The pigeons have "modified wings" that produce the whistle as they fly, but only this sudden take-off creates the alarm that causes other birds to flee.

In this recording, you can hear the difference between the two whistles, the second of which was produced by a startled pigeon.

The team report their findings in the Royal Society journal Proceedings B.

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