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The female cowbird may continue to observe this nest after laying eggs. Some bird species have evolved the ability to detect such parasitic eggs, and may reject them by pushing them out of their nests, but the female cowbird has been observed to attack and destroy the remaining eggs of such birds as a consequence, dissuading further removals. [8]
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.
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The shiny cowbird's diet consists mainly of insects, other arthropods [4] and seeds, and they have been recorded foraging for grains in cattle troughs. [ 2 ] Like most other cowbirds , it is an obligate brood parasite , laying its eggs in the nests of many other bird species such as the rufous-collared sparrow . [ 5 ]
The screaming cowbird is a specialist brood parasite, predominantly parasitizing the nests of baywings (Agelaioides). [5] [8] [9] [10] In 1874, W H Hudson was first to observe this parasitic relationship when he witnessed what he believed to be baywing chicks morph into screaming cowbird plumage.
The bronzed cowbird (Molothrus aeneus), once known as the red-eyed cowbird, is a small icterid. They breed from the U.S. states of California , Arizona , New Mexico , Texas , and Louisiana south through Central America to Panama .
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The grayish baywing (Agelaioides badius), formerly known as the bay-winged cowbird, is a species of bird in the family Icteridae. It is currently placed in the genus Agelaioides but has traditionally been placed in the genus Molothrus .