Another early morning at the Ministry of Public Relations, and another surprise.... I got onto a Yellow-browed Warbler
and watched it for a couple of minutes, and then became aware of another phyllosc
close by. This second bird looked somewhat bigger, with less "compact" proportions that the yellow-brow - it had a longer bill and tail. It displayed two well-defined yellow wingbars, and a strong supercilium, with the bill having a pink lower mandible with a dark tip. Given these features, I was reasonably confident that it was a Two-barred Greenish Warbler, though something seemed wrong - it appeared to have at least a hint of a central crown stripe (which 2BGW doesn't show) - was I screwing up an Eastern Crowned? Rather frustratingly it moved deeper and higher into cover and started preening, but was helpfully flushed by a Black-naped Monarch
, and dropped down to give me excellent, pointblank views just above head height and I could now see that it did indeed have a quite well-marked central crown stripe, and two very obvious wing bars (so ruling out Eastern Crowned). At this stage I was very confused about what it was - I see lots of Yellow-brows, Eastern Crowned and Arctic Warblers in Bangkok, plus a few 2BGWs, but this thing wasn't any of those! I guessed it might be Blyth's Leaf Warbler
, and indeed a check of the books once home, and consultation with Oriental Bird Images confirms the ID. However Blyth's has recently been split into three species including claudiae
, and it seems pretty difficult to assign a bird in the field to one or other of these species, though it is thought that migrants in Thailand are claudiae
(per Phil Round).
"Blyth's" Leaf Warbler is a non-breeding visitor to the Bangkok area, seemingly in small numbers, though I suspect it is under-recorded here.
EDIT: tried to get some photos of the Blyth's after work - whilst I did see it, it wasn't playing ball for the camera.