close up of brown-headed cowbird molothrus ater fledgling; cowbirds are brood parasites, laying their eggs in the nests of other

america animal area ater attentive bay beak bird brood brown brownheaded california close closeup common conservation copy cowbird detail environment eye fauna feathers female fledgling francisco head juvenile looking macro molothrus natural nature ornithology outdoors parasite passerine plumage portrait profile san song songbird space states united usa watching wild wildlife yellow young