Click on the link for Baillon's Crake calling at Malltraeth Marsh RSPB this evening -
http://www.youtube.com/watch?v=2jBx6b1aSmI&list=UUZiq0jOB7tehyr-DpNfkFXw&index=1&feature=plcp
Here is a sonogram of the crake calling - the call is the tightly packed lines between 2.5 and 4.0 kHz on 3, 6,9, 17, 22,24,26 and 30 seconds- click on the picture for an enlarged sonogram.
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