wgeoff

An Arctic Warbler was making a double note call near the upper school building on Po Toi today.
Double-note calls are quite common in spring so this in itself was not unusual. However, the call sounded a bit different so I recorded it, part is here

http://www.geoffwelch46.com/AWCALLGW.mp3

The sonogram looks like this



This looks more like the sonogram of the call of examinandus (middle row right hand side) than either borealis or xanthodryas in this page from the Per Alstrom paper on the three species



I mention this because the HKBWS Trip to Po Toi is tomorrow. The bird itself looks like this



[ Last edited by wgeoff at 4/05/2013 08:36 ]

wgeoff

Thanks James

The blobs below 4.5kHz on the sonogram are another bird calling (Chinese Bulbul I think) which does not appear in the shortened extract of the call I have given. So the Arctic Warbler is just the two lines between 4.5kHz and 7.5kHz and is very regular. I think it matches the right hand PA examinandus quite well but I'm not saying it is examinandus - there's lots of wriggle room here.