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The brown-headed cowbird (Molothrus ater) is a small, obligate brood parasitic icterid native to temperate and subtropical North America. It is a permanent resident in the southern parts of its range; northern birds migrate to the southern United States and Mexico in winter, returning to their summer habitat around March or April.
Brown-headed cowbird Male Female Molothrus ater (Boddaert, 1783) Three subspecies. M. a. artemisiae Grinnell, 1909 ... Cowbirds eat mostly insects and seeds.
Most avian brood parasites are specialists which parasitize only a single host species or a small group of closely related host species, but four out of the five parasitic cowbirds (all except the screaming cowbird) are generalists which parasitize a wide variety of hosts; the brown-headed cowbird has 221 known hosts.
Bronze-brown cowbird: Molothrus armenti Cabanis, 1851: 75 Brown-headed cowbird: Molothrus ater (Boddaert, 1783) 76 Scrub blackbird: Dives warczewiczi (Cabanis, 1861) 77 Melodious blackbird: Dives dives (Deppe, 1830) 78 Cuban blackbird: Ptiloxena atroviolacea (d'Orbigny, 1839) 79 Rusty blackbird: Euphagus carolinus (Müller, PLS, 1776) 80 Brewer ...
Pages in category "Cowbirds" The following 7 pages are in this category, out of 7 total. ... Bronzed cowbird; Brown-headed cowbird; G. Giant cowbird; R. Molothrus ...
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Less cowbirds are caught as the season progresses, and radio-tracked cowbirds indicate that females are sedentary during the season. In the first year, 1972, 2,200 cowbirds were eliminated using a single trap, and only 6% of the warbler nests in the region were parasitised compared to 69% previously. Average clutch size in the region almost ...
This species is frequently parasitized by brown-headed cowbirds (Molothrus ater). These birds lay 3–5 eggs that are creamy white or greenish with brown speckles in color. Usually, couples will only have one clutch; however, they might have a second clutch if the first one fails. [7]