While many birds are excellent parents, others lack any maternal or paternal instincts altogether. The common cuckoo, a nesting bird in Europe and Asia, is a well-known brood parasite that would rather slip its eggs into the nest of other bird than raise its own young. In scientific terms, “brood parasite” refers to creatures that rely on others to raise their young. In addition to some birds, this tactic is also employed by some species of insects and fish.
Photo by Bryan Stevens • Female brown-headed cowbirds stay alert to observe bird leaving or coming to a nest. Once they have located a nest, these birds slip their own eggs into the nests of other birds.
The strategy is effective, if, in the human way of thinking, rather heartless. In biological terms, however, this “foster parenting” allows brood parasites to ensure a new generation without expending much energy on the…
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