Actually I quite worry whether the sound I played is stress sound or not. I have attached the 2nd part of the video clip. If you look at Frame 3, you can see some of the birds did fly in to the BH. Your comments are welcome.
Sorry, after publish this article, i realize the video is too small to see. Will try to put on youtube.
http://www.youtube.com/watch?v=51kwpqF-4RY
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