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

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Some birds kill their siblings soon after hatching. Other birds spend their whole lives with their siblings and will even risk their lives to help each other.

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

He'd invariably see nests with two chicks inside, a big chick and a little chick — but then the little one would disappear. So a few days after laying an egg, the mother lays a second one, as a kind of insurance policy in case the first egg fails. But if the first egg hatches successfully, then the backup isn't needed and it would be too much work to feed a second hungry mouth. That's why nature — in the form of the older sibling — simply kills the second chick off, as soon as it hatches.Nazca boobies lay one or two eggs.

 

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