In 'bizarre behavior,' New Zealand penguins lay one egg, reject it, and then lay another. Now, scientists know why.

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Erect-crested penguins commonly perform a practice that's rare in birds: They lay an egg only to reject it, to ensure the survival of a second, bigger egg. Researchers finally cracked the case of this odd behavior.

In 'bizarre behavior,' New Zealand penguins lay one egg, reject it, and then lay another. Now, scientists know why. : Read more