Cowbird

Cowbirds
Female Brown-headed Cowbird
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Passeriformes
Family:	Icteridae
Genus:	Molothrus Swainson, 1832

Cowbirds are birds of the genus Molothrus. They are brood parasites, similar in life-style to the Cuckoo. The entire family Icteridae is limited to the New World.

They lay their eggs in the nests of other birds. The birds whose nest is used by the cowbird is tricked into raising the young cowbirds.^[1]

These birds feed on insects, including those stirred up by cattle. They lay their eggs in other birds' nests. This means that the birds can more easily stay with the herd.^[2]

The Brown-headed Cowbird has over 220 hosts.^[3] The other cowbird species have fewer known hosts, but all the species are generalists when it comes to choosing a host. This means that the eggs may look very different from the hosts' eggs.

1. ↑ Mermoz, Myriam E. and Francisco Oralis, Juan 2004. Phylogenetic analysis of life-history adaptations in parasitic cowbirds. Behavioral Ecology 15 109-119 [1]
2. ↑ Jeffrey P. Hoover; Scott K. Robinson (2007). "Retaliatory mafia behavior by a parasitic cowbird favors host acceptance of parasitic eggs" (PDF). Proceedings of the National Academy of Sciences. Archived from the original (PDF) on 28 December 2013. Retrieved 26 August 2009.
3. ↑ Friedmann, Herbert; LLoyd E. Kiff and Stephen I. Rothstein (1977). "A further contribution to knowledge of the host relations of the parasitic cowbirds" (PDF). The Smithsonian. Smithsonian Institution Press. Archived from the original (PDF) on 29 April 2012. Retrieved 26 August 2009.