Cowbird mothers abandon their eggs in the nests of other bird species, but the chicks somehow manage to find their flock and ...

When the female cowbird lays her egg in the nest, she also removes one or two warbler eggs from the nest. Generally, she takes out more eggs than she puts in the nest. When throwing away eggs, she ...

A female cowbird may choose a bird nest for her uninvited egg in three ways. During the early breeding season she may choose a high perch from which to watch for nest-building activities by other ...

Cowbird Eggshells Dropped From Above Break Other Birds' Eggs. Published May 10, 2018 at 11:41 AM EDT Updated May 10, 2018 at 3:51 PM EDT.

Because cowbird eggs require a shorter incubation period, and female cowbirds can lay more eggs than most wild birds, their chances of survival in host nests surpass those of the host’s own young.

DEAR JOAN: A California towhee has built a nest in our jasmine bush. She laid three eggs about one week ago. Now we look in the nest and there is a fourth egg and it sure looks like a cowbird egg.

Brown-headed cowbird eggs have been found in the nests of 221 North American songbird species. There are six cowbird species in the Western Hemisphere, three in the U.S. — brown-headed, ...

Black birds with a greenish sheen and brown heads sometimes visit my yard during spring migration. These are male brown-headed cowbirds, and they often arrive in mixed flocks of red-winged blackbirds ...

Some would-be hosts of the cowbird eggs take matters into their own hands. While most host species are unable to distinguish cowbird eggs from their own, some do.

Some would-be hosts of the cowbird eggs take matters into their own hands. While most host species are unable to distinguish cowbird eggs from their own, some do.

A female cowbird may choose a bird nest for her uninvited egg in three ways. During the early breeding season she may choose a high perch from which to watch for nest-building activities by other ...