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siblinghood

A Nazca booby in the Galápagos Islands incubates eggs with its webbed feet. Wolfgang Kaehler/LightRocket via Getty Images hide caption

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Wolfgang Kaehler/LightRocket via Getty Images

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

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Scholars Susan Ashbrook Harvey, left, and Robin Darling Young became 'sworn siblings' after an ancient ritual at the Church of the Holy Sepulchre in Jerusalem. Keren Carrion/NPR; Jodi Hilton for NPR hide caption

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Keren Carrion/NPR; Jodi Hilton for NPR

How two good friends became sworn siblings — with the revival of an ancient ritual

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