单词preen gland
un.: 尾羽腺;尿臀腺网络: 尾脂腺;幼鸭需依赖其母亲的尾脂腺;润羽腺
尿臀腺
尾羽腺
They noted that each bird rubbed its cheek against its preen gland and then onto its neck, back and breast feathers.
研究人员注意到,每一只火烈鸟用脸摩擦尾羽,然后再将这种颜料抹在颈部,背部和胸部的羽毛上。