The Study on the Function and Growth of Meat Duck Preen Gland under Diffe…
肉鸭尾脂腺功能、生长发育及其受旱养方式影响研究；
They noted that each bird rubbed its cheek against its preen gland and then onto its neck, back and breast feathers.
他们注意到，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。
They noted that each bird rubbed its cheek against its preen gland and then onto its neck, back and breast feathers.
他们注意到，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。
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