Brown-headed Cowbird.

Wyalusing State Park, Wisconsin

 

An interesting bird that is very adept at nest parasitism. It is well documented that many songbird populations have declined, at least locally, due to this behavior. A well documented example is the Kirtland's Warbler, a previously endangered species (it's now Near Threatened) that has had significant increase in recruitment following interventions that decreased Cowbird populations that threatened this warbler. Nonetheless I've always considered the Cowbird to be a handsome species and one I enjoy photographing.

Done