Brood parasitism is a reproductive strategy where one species, known as the brood parasite, lays its eggs in the nest of another species, called the host. The host then unknowingly raises the parasite's young, often at the expense of its own offspring. This behavior is seen in various bird species, such as the cowbird and cuckoo. Brood parasites have evolved specific traits to increase their chances of success. For example, some may mimic the appearance or calls of the host's eggs or chicks, making it harder for the host to detect the intruder. This strategy allows the brood parasite to conserve energy and resources while ensuring the survival of its young.