Wednesday, May 30, 2007

Double raps produced by duck wings

Check this out.

1 comment:

Anonymous said...

Another good find! Cornell and many other sources have described the double-rap as "distinctive." Naturally, this leads people to believe that a good recording of a double-rap must come from an Ivory-bill. Obviously not true, but it's part of the large pile of weak evidence that the rediscovery claim is based upon.

To bring up another point I first saw here, where's all the "loud wooden wing noise" in the audio recordings?

Tanner: In the initial flight, when the wings are beaten particularly hard, they make quite a loud, wooden, fluttering sound, so much so that I often nicknamed the birds 'wooden-wings'; it is the loudest wing sound I have ever heard from any bird of that size except the grouse.

Geoff Hill: (edited to include only the relevant points) Bird flushed from about 30 feet... It made no sound at all as it flew.

If someone reported flushing a ruffed grouse, and told you "it made no sound at all as it flew," would you believe the report? By the way, based on what Hill has said I think he's wrong about the Ivory-bill, but I don't doubt his conviction.

To the best of my recollection, only one sighting has included mention of loud flight. If it really is so distinctive, why is it missing from the descriptions, and why doesn't it show up in the ARU recordings?