Cowbirds
Brown-headed Cowbird (Molothrus ater) is widely distributed across the U.S. Bronzed Cowbird (Molothrus aeneus) is a southwestern species that wanders as far east as Florida. Males and females have different plumage, but bill shape and thick neck are good field marks. Only Bronzed Cowbirds have the red eye. Cowbirds are nest parasites: female lays eggs in nest of other species after removing original eggs; chicks grow faster and larger than host's own offspring and out feed and kill rivals. Yet somehow young raised by forster parents don't imprint and know they are cowbirds. All images made at various locations in AZ.
Brown-headed Cowbird 023NPN

Brown-headed Cowbird BHCO 023

Brown-headed Cowbird 027NPN

Brown-headed Cowbird BHCO 027

Brown-headed Cowbird 031NPN

Brown-headed Cowbird BHCO 031

Brown-headed Cowbird 051B-720

Brown-headed Cowbird BHCO 051

Brown-headed Cowbird 058A-720

Brown-headed Cowbird BHCO 058

Brown-headed Cowbird 060A-720

Brown-headed Cowbird BHCO 060

Bronzed Cowbird 004NPN

Bronzed Cowbird BRCO 004

Cowbird species 001A-720

Cowbird species 001