cow·bird (koubûrd)
n.
Any of various blackbirds of the genus Molothrus, especially the common North American species M. ater, that lay their eggs in the nests of other birds and are often seen accompanying herds of grazing cattle.

[TahlilGaran] American Dictionary ▲

cowbird
[From their habit of staying with cattle.]

[TahlilGaran] American Dictionary ▲