Only six (4%) of the nests were parasitized by Brown-headed Cowbird
(three Bobolink, two Eastern Meadowlark, and one Grasshopper Sparrow); none fledged a Brown-headed Cowbird
A brown-headed cowbird
control program has significantly reduced the threat of nest parasitism and allowed the Kirtland's warbler population to grow.
The main sources of nest mortality for North American songbirds include predation (Martin, 1988, 1993; Martin and Li, 1992) and brown-headed cowbird
parasitism (Friedmann and Kiff, 1985; Ortega, 1998).
This month's cover image,  Plate 99 from Birds of America (printed in stages during 1827-1838) by American ornithologist, naturalist, and painter John James Audubon (1785-1851), shows a pair of oft-vilified brown-headed cowbirds
There was no difference in relative abundance of brown-headed cowbird
(U = 310.
(Molothrus ater) in Florida's breeding bird atlas: A collaborative study of Florida's birdlife.
are a New World blackbird, which - like cuckoos - lay their eggs in the nests of other birds, though evolution made no attempt to make their eggs look like those of their hosts.
The North American brown-headed cowbird
, which is not a cuckoo but a member of the blackbird family, and the common cuckoo mentioned earlier are probably the world's most successful and well-known brood parasites.
(Molothrus ater): Smaller blackbird; males have a brown head.
Sonny was a fledgling brown-headed cowbird
, (Molothrus ater) ugly and noisy, there was no mistaking that.
The brown-headed cowbird
lays its eggs in the nests of other birds.
These great forest fortresses buffer nesting birds from nest parasites like the brown-headed cowbird
and the killing forays of neighborhood house cats that make sorties into suburban-rimmed woodlands.
She then discusses the introduction and eventual impact of two alien invaders, cheat-grass and the brown-headed cowbird
Nesting buntings that evade these predators must contend with the starling- sized brown-headed cowbird
, another prime suspect in the case of the disappearing bunting.
Cowbird parasitization: The reproductive success of some neotropical migrants has been seriously compromised by the brown-headed cowbird