Pix, call and song of passage migrant Arctic Warbler (s.s.)

Arctic Warbler, Kamchatka Leaf Warbler and Japanese Leaf Warbler (the splits of the Arctic Warbler complex) cannot be safely separated on physical features alone, even if the Japanese is on average more yellow than the others. That leaves us with calls and songs as the only safe method of identification. 

At Hanoi, I have so far only recorded  the Arctic Warbler (sensu stricto). It is now the peak passage. They tend to be very vocal and are often heard before they are seen.

Recording of call + song (Hanoi, 27th April):

Other singing phylloscs seen recently included Dusky, Radde's and Yellow-browed.