The colors are light red, brown red, rose red, brown, or greyish white.
颜色呈浅红、褐红、玫瑰红色、褐及灰白色等。
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,翼前缘经常为淡棕色或黄棕色,比飞羽的深灰色要浅。
At necropsy, muscles in the leg were white or greyish -white.
尸检主要见腿部肌肉色白或灰白色。
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