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Nell Greenfieldboyce

For birds, siblinghood can be a matter of life or death

Dave Anderson David Anderson
A Nazca booby in the Galápagos Islands incubates eggs with its webbed feet. (Wolfgang Kaehler/LightRocket via Getty Images)

The Science of Siblings is a series exploring the ways our siblings can influence us, from our money and our mental health, all the way down to our very molecules. We'll be sharing these stories over several weeks.

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