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no build her own nest, incubate her own eggs and raise her own young. She lays her eggs in the nests of other, often smaller, birds who then incubate them and raise the young usually to the detriment of her own nestlings. They starve for the young cowbird is not only larger but more aggressive in demanding food from the adults. The list of species on which the cowbird, termed a brood parasite, imposes eggs is growing. Populations of many of those species are declining at an alarming rate.
The cowbird was originally a bird of the prairies. They had a symbiotic relationship with herds of buffalo which both attracted and stirred up insects for cowbirds to eat. In return, cowbirds rid bison of troublesome parasites such as ticks, often perching on the backs of buffalo to do so.
A bird that follows herds of buffalo does not have time for nest building, egg incubation, and the constant and the frequent feeding of young. In consequence, the cowbird began laying her eggs in the nests of other birds. This evolution in behavior required millions of years.
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