cowbird

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cowbird,

New World bird of the blackbird and oriole (hangnest) family. The male eastern, or common, cowbird is glossy black, about 8 in. (20 cm) long, with a brown head and breast; the female is gray. Most cowbirds lay their eggs in the nests of smaller bird species, victimizing especially vireos, sparrows, and flycatchers. Sometimes the alien egg is ejected or buried under a new nest floor or the nest is abandoned, but usually the host bird incubates the egg and feeds the voracious intruder while its smaller offspring are starved or crowded out. Cowbirds eat seeds but feed chiefly on insects, following behind grazing cattle in order to capture the insects stirred up in this way—hence the name cowbird and the earlier name buffalo bird. Related birds are the bronzed, the California, the dwarf, the Nevada, and the red-eyed cowbirds. Cowbirds are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Aves, order Passeriformes, family Icteridae.
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Sex ratios and survival probabilities of brown-headed cowbirds (Molothrus ater) in southwest Colorado.
(2010) Community-level patterns of host use by the brownheaded cowbird (Molothrus ater), a generalist brood parasite.
Brown-headed cowbird (Molothrus ater) in Florida's breeding bird atlas: A collaborative study of Florida's birdlife.
Brown-headed Cowbird (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.
Early successional species such as brown-headed cowbirds (Molothrus ater) and yellow-breasted chats (Icteria virens) might be expected to occur more frequently in areas heavily disturbed by military training or by forestry practices that create forest openings and increase edge (2, 3).
The true cowbird (Molothrus ater) is a member of the blackbird family and no kin to egrets or herons.
However, 90% of brood parasitism by Brown-headed Cowbirds (Molothrus ater) was in fragmented habitat.
Savannah Sparrows and Brown-headed Cowbirds (Molothrus ater) showed no significant response to fire.
Records of birds from June through August indicated plot use by Song Sparrows (Melospiza melodia; 21 g), Savannah Sparrows (Passerculus sandwichensis; 20 g), Goldfinches (Carduelis tristis; 13 g), Brown-headed Cowbirds (Molothrus ater; 44 g), House Sparrows (Passer domesticus; 28 g), and Mourning Doves (Zenaidura macroura; 130 g).
Cowbird (Molothrus ater) parasitism of dickcissels (Spiza americana) in different habitats and at different nest densities.
Another explanation for why immigrants exhibit a lower repertoire size could be through suppression of certain song themes, for example, in relation to social dominance as in cowbirds Molothrus ater (West et al.