Female Brown-headed Cowbird

Female Cowbirds lay their eggs in another bird’s nest, duping the unsuspecting parents into raising the Cowbird’s young.

Females

Female Cardinal

Female Bluebird

Female Red-winged Blackbird

Female Brown-headed Cowbird

Female Pileated Woodpecker

Yellow Warbler

I found this bird flying from spot to spot near a marsh.  Fairly common Yellow Warblers often raise the young of Brown-headed Cowbirds. 

Brown-headed Cowbirds will lay an egg in the Yellow Warblers nest and if the Warbler doesn’t catch on to the trick will raise the Cowbird’s young at the expense of its own.

For more information please see: Yellow Warbler

Brown-headed Cowbird

Brown-headed Cowbirds are fairly common in this area.

During the early part of the Fall season they move through here in great migratory flocks.  I’ve seen them sitting so thick in a tree that the tree looks like a tree with black leaves.

Unlike the Pileated Woodpecker which remains year-round.