The parasite female flies away and never sees her offspring. The host bird or birds are fooled into raising the foreign chick as their own. The brood parasite seems to get a pretty sweet deal: she doesn’t have to spend energy and time raising her own chicks.

January 1, 2021 - Brood parasites are birds that lay eggs in other species’ nests. North America’s most common brood parasite is the Brown-headed Cowbird. Shiny Cowbirds and Bronzed Cowbirds also occur in localized areas of the southernmost United States and Caribbean. There are more species that are considered ...

August 27, 2026 - In the dramatic clip above, a newborn Common Cuckoo wiggles its way around the Reed Warbler’s nest, using its shoulders and back to push out all three of the host’s eggs. Brood parasites, it seems, are basically born evil—the honeyguide, ...

Cowbirds and cuckoos are the most commonly studied avian brood parasites (Davies 2000), although obligate interspecific brood parasitism has evolved at least 7 separate times among various avian clades, including cowbirds (Icteridae), honeyguides (Indicatoridae), Old World cuckoos (Cuculinae), twice in the New World cuckoos (Neomorphinae), indigobirds and their allies (Ploceidae), and the Black-headed duck (Anatidae).

July 17, 2026 - It is a pervasive type of relationship occurring in several species of plants and animals. Brood parasitism, which commonly manifests in birds, is a reproductive strategy characterized by laying one's eggs (parasite) into the nest of another (host).

June 30, 2023 - What you saw was a brood parasite, an animal that fools animals of other species into caring for its offspring, usually at the expense of the host species’ own young. We have known about brood parasites since at least the days of Aristotle, who wrote “The cuckoo… does not build a nest.

Brood parasitism is a breeding strategy in which the brood parasite female evades all parental care by laying its eggs in host nests of the same (conspecific brood parasitism, CBP) or different species (interspecific brood parasitism, IBP) relying on unrelated foster parents to care for their parasitic offspring.

January 12, 2024 - In this form of parasitism, the parasite does not directly parasitize the host. Instead, it lays its eggs in the host’s nest, allowing the host to raise young that are not directly related to them.

Some species of birds thrive not by carefully rearing their own young, but by pawning that task off on adults of other species. The European Cuckoo, whose distinctive call is immortalized in the sound of the "cuckoo clock," is the bird in which this habit has been most thoroughly studied.

Brood parasitoids are parasites that kill the host's offspring during the course of their own development.

December 23, 2025 - Brood parasitism is a phenomenon in which certain animals—parasites—will lay their eggs in the nests of other animals (hosts), which can be of the same species or different ones.

May 8, 2026 - Some birds and other animals are 'brood parasites' whose mothers leave their offspring with other species.

September 18, 2026 - Brood parasitism is a form of social parasitism, primarily observed in birds, where one species lays its eggs in the nest of another species and provides no parental care. The host bird then incubates the eggs and raises the young parasite as ...

Brood parasites are organisms that lay their eggs in the nests of other species, causing the host's parents to rear their offspring, often resulting in intense begging behavior from the parasite's nestling that competes for food with the host's own young.

Other obligate brood parasites include: all African Honeyguides, about half of the species of cuckoos, the Black-headed Duck in South America, Shiny Cowbirds, Screaming Cowbirds, Bronzed Cowbirds, and Giant Cowbirds.

May 14, 2025 - The article discusses brood parasitism ... social and sexual monogamy, revealing that many birds are socially monogamous but rarely sexually exclusive. Brood parasites exploit hosts, sometimes resulting in violent retaliation....

October 2, 2024 - Only about 1 percent of all bird species resort to this sneaky family planning method, called obligate brood parasitism, but it has evolved at least seven separate times in the history of birds and is a way of life for at least 100 species.

October 21, 2013 - Currently, research suggests that obligate interspecific brood parasitism arose seven times independently during evolution. This includes three origins among cuckoos, and then one origin each in cowbirds, honeyguides, estrildid finches, and a South American duck.

February 1, 2011 - Brood parasitism is an awkward term to describe an interaction between two species in which, as in predator-prey relationships, one species gains at the expense of the other.