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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.
The brown-headed cowbird produces very rapid clusters of notes that alternate in frequency, with the right syrinx producing the high frequency notes and the left syrinx producing low frequency notes. The entire cluster is sung during a single respiratory expiration, called "pulsatile expiration", in which no inflow of air occurs between notes.
The genus was introduced by English naturalist William Swainson in 1832 with the brown-headed cowbird (Molothrus ater) as the type species. [2] [3] The genus name combines the Ancient Greek mōlos, meaning "struggle" or "battle", with thrōskō, meaning "to sire" or "to impregnate". [4]
Brown-headed cowbird. Dark-eyed junco. Red-winged blackbird. European starling. A European Starling feeds in Ellison Park in Brighton. The birds, originally brought to the North America in the ...
A shiny cowbird chick (left) being fed by a rufous-collared sparrow Eastern phoebe nest with one brown-headed cowbird egg (at bottom left) Shiny cowbird parasiting masked water tyrant in Brazil. Brood parasitism is a subclass of parasitism and phenomenon and behavioural pattern of animals that rely on others to raise their young.
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. Michigan
Song sparrows' nests are parasitized by the brown-headed cowbird. The cowbirds' eggs closely resemble song sparrows' eggs, although the cowbirds' eggs are slightly larger. Song sparrows recognize cowbirds as a threat and attack the cowbirds when they are near the nest. There is some evidence that this behavior is learned rather than instinctual ...
The US Fish and Wildlife Service's 5-year review of least Bell's vireo, dated September 2006, attributes the primary cause of population declines to loss of riparian habitat in California. Another threat listed by the review is from the brown-headed cowbird which lays its eggs in other birds' nests, called brood parasiteism. The Southern Sierra ...
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