dark trailing edge of wings, very white primary bases below, and for adults unbarred pale rufous tail (there may be a hint of a dark end-band);

  • 飞羽外边缘黑色,翼下初级飞羽白色非常显眼,成鸟尾羽下部棕色,无条纹(有时末端有一黑纹);
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