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

03:55

Nell Greenfieldboyce

May 01, 2024

A Nazca booby in the Galápagos Islands incubates eggs with its webbed feet. (LightRocket via Getty Images)

Related:

The Science of Siblings
COMIC: Our sun was born with thousands of other stars. Where did they all go?
In the womb, a brother's hormones can shape a sister's future

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