Cowbirds are migratory birds that are commonly found in North and South America. These birds are known for their peculiar behavior of laying their eggs in the nests of other bird species, which then hatch alongside the host bird's offspring. However, there are several synonyms that can be used instead of "cowbirds". One of the most common is "brood parasites" as they lay their eggs on the nests of other bird species. Another alternative is "foster birds" since they leave their young with other birds to foster. "Cuckoo finches" and "nest outlaws" are also terms used to describe cowbirds. Despite their unusual actions, cowbirds play a vital role in the ecosystem, and their behavior has fascinated both scientists and bird lovers alike.