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黃腰柳鶯Pallas's Leaf Warbler?

The bird does show a crown stripe, in my view. It is certainly visible in the second photograph.

Besides, it shows a broad supercillium, especially in front of the eye, that looks yellowish as well, bordered by a blackish eye stripe.

All that points more to Pallas's Leaf Warbler than to Yellow-browed Warbler to me.

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It"s true that Yellow-browed Warbler can sometimes show a faint crown stripe, but I think it tends to be more diffuse than in Pallas's, less prominent.

The supercillium of your bird is very broad and yellow, reaching the forehead. I would expect it to be less prominent in Yellow-browed in comparison.

http://ibc.lynxeds.com/photo/yel ... llow-browed-warbler This bird shows a diffuse crown stripe. Note the (white) supercillium in front of the eye.

http://www.freewebs.com/suffolkbirding/october2011.htm. Same goes for the supercillium here. Compare it to this Pallas's: http://www.portlandbirdobs.org.uk/latest_oct2010.htm and also note the dark eye stripe.

But anyway, if you saw a yellow rump, that would exclude Yellow-browed all together.

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