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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.
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The adults are very aggressive towards other birds invading their territories and this may be why shiny cowbird (molothurus bonairensis) nest parasitism was not recorded for this species. It is a sedentary species, unlike the related gray kingbird ( T. dominicensis ) and it will move into the preferred habitat of the gray kingbird when the ...
The brown-headed cowbird eggs have been documented in nests of at least 220 host species, including hummingbirds and raptors. [14] [15] More than 140 different species of birds are known to have raised young cowbirds. [16] The young cowbird is fed by the host parents at the expense of their own young.
Black-headed grosbeaks frequently sing from prominent perches. Both the male and female sing, but have different songs, and both are known to sing from the nest while incubating. When trying to court a female, males fly with their wings and tails spread. They forage in the foliage, on the ground, or in low vegetation and are prominent berry eaters.
Different host species show different responses to their nests being parasitised, with behaviours ranging from accepting and caring for the cowbird eggs, to rejecting the eggs from the nest. [2] As the shiny cowbird is an effective generalist brood parasite, it can be considered the South American counterpart to the brown-headed cowbird.
Female hooded orioles lay a clutch of 3–5 eggs. The eggs are generally white, but can range into a pale blue with darker splotches. The eggs are incubated for 12–14 days, and the nestlings take about 14 days to fledge. This species is also commonly parasitized by the brown-headed cowbird and the bronzed cowbird. [9]
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.