In both photos, the supercilium appears to reach the bill base, pointing away from Arctic.
在这两张照片中，眉斑看来皆往前延伸到嘴喙的基部，这点便和极北柳莺不同。
The majority of Arctics to my eye seem to have ochre-toned legs, and the supercilium does not reach the bill (which can be very hard to judge in the field).
在我看来大多数的极北柳莺似乎有黄土色的脚，且眉线没有到达喙。
The majority of Arctics to my eye seem to have ochre-toned legs, and the supercilium does not reach the bill (which can be very hard to judge in the field).
在我看来大多数的极北柳莺似乎有黄土色的脚，且眉线没有到达喙。
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