brendank

A good find! Did you compare the sounds on xeno-canto? Geoff Carey also has an excellent recording of Martens's Warbler here:

http://www.hkbws.org.hk/BBS/redi ... 2&goto=lastpost

A think the lack of an wingbar and thin complete eyering suggests Martens's Warbler.

[ Last edited by brendank at 25/02/2013 22:32 ]

brendank

Alström & Olsson, 1999, suggest that Bianchi's Warbler completely lacks a wingbar in <10% of birds. This bird clearly lacks a wingbar, as did the bird at Aberdeen Reservoir and also the one I saw at LFS in January. The bird at Pak Sha O also seemed to lake a wingbar during my brief views of it. The probability of observing four such Bianchi's Warbler without a wingbar is 0.01% assuming only 10% lack a wingbar suggesting that at least some aren't Bianchi's Warbler.