Taiwan Bush Warbler, a unusual behaviour, a set on Flickr.
The strange behaviour and atypical call of Taiwan bush warbler....
In 2400m, I found a small movements inside the bush in roadside . In the beginning, that bird was very silent, just WALK close to the ground. After somebody playback the typical song of Taiwan bush warbler, he make atypical call "gagagagagagaga~~", like the alarm call of Chinese bulbul. He start to provide some short repeat of typical song once and twice, and walked into the base of grasses. Then he make the atypical call for minutes and leave. On that time, there might be two individuals, but only one make sounds.
The sound: dl.dropbox.com/u/18689552/UnknownAudios/110425_14_1419par...
In the recording, it starts from the atypical call, then provides the typical song repeated 1-3 times. After a period of pause, other birdwatchers playback a series of typical song.