The internal incubation of cuckoo eggs prior to laying, first theorized two centuries ago but long thought impossible, was found to be the method whereby cuckoo chicks obtain the head start necessary to bring about the deaths of their foster siblings. | Harper's Magazine

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The internal incubation of cuckoo eggs prior to laying, first theorized two centuries ago but long thought impossible, was found to be the method whereby cuckoo chicks obtain the head start necessary to bring about the deaths of their foster siblings.

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The internal incubation of cuckoo eggs prior to laying, first theorized two centuries ago but long thought impossible, was found to be the method whereby cuckoo chicks obtain the head start necessary to bring about the deaths of their foster siblings.

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