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How do Kirtland’s warblers protect their nests from cowbird parasitism?

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If cowbird eggs are allowed to hatch in a Kirtland’s warbler nest, the chicks can compete with young warbler nestlings for food, which threatens their survival. Kirtland’s warblers can protect their nests from cowbird parasitism because they have developed the ability to recognize cowbird eggs, and they respond by building a new nest on top of the parasitized one.

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