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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Members can tell stories and participate in exchanges with other members through commenting, loving stories (the Cowbird version of a like), sending messages and joining audiences.
Bohm Woods exhibited the lowest Brown-headed Cowbird density of the three forest patches (Table 4).
Egg-laying cowbirds still strike, and Hoover had for years left the cowbird eggs alone.
The cowbird is native to the United States, but its range has expanded, he said.
The cowbird can seem a rather comical creature with a slow, awkward walk and often upraised tail.
Thomas, Springfield, Illinois), without supporting data, that the incubation period of the Bronzed Cowbird is 12-13 days is followed by a reference to Carter (Carter, M.
Cowbirds are spreading around the country wherever big forests are cut into smaller ones.
Territoriality and mating behavior of the male brown-headed cowbird.
Community-wide patterns of parasitism of a host "generalist" brood-parasitic cowbird.
Cowbird host suitability is dependent on several factors, including overlapping breeding seasons, acceptance of cowbird eggs, and nest accessibility to laying female cowbirds (Sealy et al.
Cowbird eggs are bigger than many of the eggs in nests they "borrow.