Identify the type of symbiosis described. The brown-headed cowbirds lay eggs in other birds’ nests. They trick the birds into raising their young. The cowbirds hatch first and push the eggs out of the nest. The cowbirds are then fed by the nest-builder.

The cowbirds benefit because other birds feed and raise their young, while the nest-builders lose their eggs and spend energy caring for the cowbirds. This is parasitism: one organism benefits while the other is harmed.

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