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Cowbirds are birds belonging to the genus Molothrus in the family Icteridae. They are of New World origin, but some species not native to North America are invasive there, and are obligate brood parasites , laying their eggs in the nests of other species.
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.
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] 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 ...
Screaming cowbirds deceive their main host, the baywing, with superb visual chick mimicry. [10] [24] In fact, screaming cowbirds are the only avian brood parasite to exhibit this trait. [21] [25] There are slight differences in skin and bill colour of nestlings but this is only present for the first 4–5 days. They then remain almost identical ...
The giant cowbird is now one of six cowbirds placed in the genus Molothrus that was introduced in 1832 by William Swainson. [5] Two subspecies are recognised: [5] M. o. impacifus (Peters, JL, 1929) – east Mexico to west Panama; M. o. oryzivorus (Gmelin, JF, 1788) – central Panama to Peru, Bolivia and north Argentina
Pages in category "Cowbirds" The following 7 pages are in this category, out of 7 total. This list may not reflect recent changes. ...
Like all cowbirds, this bird is an obligate brood parasite; it lays its eggs in the nests of other birds. The young cowbird is fed by the host parents at the expense of their own young. Hosts include Prevost's ground-sparrows and white-naped brush finches. They develop rapidly, leaving the nest after 10–12 days.
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