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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.
Shiny cowbird: Molothrus bonariensis (Gmelin, JF, 1789) At least 102 species [7] Brown-headed cowbird: Molothrus ater (Boddaert, 1783) At least 174 species [7] Screaming cowbird: Molothrus rufoaxillaris Cassin, 1866: Most commonly Agelaioides badius, occasionally four other species [d] [8] Giant cowbird: Molothrus oryzivorus (Gmelin, JF, 1788)
Screaming cowbird; Shiny cowbird This page was last edited on 18 March 2013, at 04:52 (UTC). Text is available under the Creative ...
Screaming cowbird: Molothrus rufoaxillaris Cassin, 1866: 71 Giant cowbird: Molothrus oryzivorus (Gmelin, JF, 1788) 72 Shiny cowbird: Molothrus bonariensis (Gmelin, JF, 1789) 73 Bronzed cowbird: Molothrus aeneus (Wagler, 1829) 74 Bronze-brown cowbird: Molothrus armenti Cabanis, 1851: 75 Brown-headed cowbird: Molothrus ater (Boddaert, 1783) 76 ...
In contrast, the screaming cowbird is a brood parasite of the grayish baywing, and while adult screaming cowbirds are overall blackish, juvenile screaming cowbirds closely resemble grayish baywings.
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]
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The giant cowbird (Molothrus oryzivorus) is a large passerine bird in the New World family Icteridae. It breeds from southern Mexico south to northern Argentina, and on Trinidad and Tobago . It may have relatively recently colonised the latter island.