Which bird lays its eggs in another bird’s nest?

Introduction: Avian Brood Parasitism

Avian brood parasitism refers to the behavior of certain bird species that lay their eggs in the nests of other bird species, which then raise the parasitic chicks as their own. This phenomenon is found in many bird families and is considered a unique adaptation to ensuring reproductive success. Brood parasitism has fascinated ornithologists for centuries, and it has been studied extensively to understand its evolutionary origins, mechanisms, and ecological consequences.

Why Do Birds Lay Eggs in Other Nests?

Birds that engage in brood parasitism have evolved this strategy to increase their reproductive success at the expense of other birds. By laying their eggs in other nests, brood parasites do not have to invest in nest building, incubation, or chick rearing, which saves them time and energy. Moreover, brood parasites reduce the risk of predation on their own eggs and chicks by distributing them among different host nests. Host birds, however, pay a high cost for raising parasitic chicks, which compete for resources and may harm their own offspring. Despite these costs, some host species have developed defenses against brood parasites, leading to an arms race between parasites and hosts.