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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.
“These species form large groups on the wintering grounds and during migration, ... Common Grackles or Brown-headed Cowbirds. All of these birds forage on the ground, ...
In all Connecticut species, males are polygamous and have elaborate courtship displays. These heavily built birds have legs feathered to the toes. Most species are year-round residents and do not migrate. Five species have been recorded in Connecticut. Wild turkey, Meleagris gallopavo; Ruffed grouse, Bonasa umbellus
The chipping sparrow lays a clutch of two to seven pale blue to white eggs with black, brown, or purple markings. They are about 17 by 12 millimetres (0.67 by 0.47 in), and incubated by the female for 10 to 15 days. [7] The chipping sparrow is often brood parasitized by brown-headed cowbirds, usually resulting in the nest being abandoned. [6]
We talked with an expert at the Cornell Lab of Ornithology to find out.
Brown-headed cowbirds (Molothrus ater) parasitize eastern towhee nests. In a South Carolina old field, 5 of 19 eastern towhee nests were parasitized. [51] Each parasitized nest contained 1 Brown-headed Cowbird egg. The desertion rate for parasitized nests was 20%, which was similar to nests that had not been parasitized (21%).
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.
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