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Although Carolina wrens are fairly common, brood parasitism by the brown-headed cowbird is common, with up to 25% of Carolina wren nests being affected in certain regions such as Oklahoma and Alabama. [3] [17] Cowbird parasitism peaks in April at 41%, and is as low as 8% and 0% in July and August, respectively. Female cowbirds sometimes eject ...
The brown-headed cowbird is an obligate brood parasite; it lays its eggs in the nests of other small passerines (perching birds), particularly those that build cup-like nests. The brown-headed cowbird eggs have been documented in nests of at least 220 host species, including hummingbirds and raptors.
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]
Carolina wren. Wrens are small and inconspicuous birds, except for their loud songs. They have short wings and thin down-turned bills. Several species often hold their tails upright. All are insectivorous. Rock wren, Salpinctes obsoletus (A) Canyon wren, Catherpes mexicanus; House wren, Troglodytes aedon; Winter wren, Troglodytes hiemalis
One study found that 9% of nests had brown-headed cowbird eggs in them. [32] It likely evades parasitism partly because of its late breeding season. [33] The American goldfinch also makes a very poor host for brood parasites, with studies showing low hatching rates of brown-headed cowbird eggs and no fledging success.
Choose from an Eastern Bluebird, a Downy Woodpecker, a Baltimore Oriole, and a Brown-headed Cowbird. Kansas is the perfect opportunity to add some breadth to your birding journal. 21.
After the eggs have been laid, both males and females cover “nest duty,” where the eggs will incubate for an average of 21 days, continued the National Audubon Society. The White Ibis.
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.