• Upperwing has pale greyish-white primary bases and often pale rufous or yellowish-brown forewing, paler than dark grey flight-feathers.

    翼上初级飞羽呈现灰白色,翼前缘经常棕色黄棕色,飞羽的深灰色

    youdao

  • Upperwing has pale greyish-white primary bases and often pale rufous or yellowish-brown forewing, paler than dark grey flight-feathers.

    翼上初级飞羽呈现灰白色,翼前缘经常棕色黄棕色,飞羽的深灰色

    youdao

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