cowbird

1. People have long wondered how cowbird can get away with leaving their eggs in the nests of other species, who then raise the baby cowbirds.
   人们一直奇怪牛鹂为何能够成功地把自己的蛋留在其他鸟类的巢中，而其他鸟类就会帮其抚养其幼鸟。

noun

1. North American blackbird that follows cattle and lays eggs in other birds' nests