The common brown-headed cowbird is the most widespread brood parasite in North America. Poly­typic. Length 7.5". A smallish, compact and stocky blackbird with a short and thick-based bill ...

Because cowbird eggs require a shorter incubation ... each year would be better spent in the long term on [forest] habitat ...

This bird only nests in young jack pine forests in northern Michigan. In 1971, a census recorded only 201 singing males, and both limited/poor quality of habitat and cowbird parasitism were proposed ...

Brown-headed Cowbirds (Molothrus ater) are brood parasites that lay their eggs in the nests of host species. Cowbird chicks typically grow up in mixed broods consisting of one or more cowbird chicks ...

In contrast, least Bell’s vireo (V. bellii pusillus) and southwestern willow flycatcher (Empidonax traillii extimus) still require cowbird control after modest increases in suitable habitat. Our ...

Brood parasite, lays eggs in other birds’ nests. A female cowbird may lay as many as 40 eggs during the nesting season. Eggs are white with brown spots and are usually larger than host eggs. Female ...