Why house sparrows lay both big and small eggs

Bigger isn't always better, as biologists who spent six years looking at the egg sizes of an insular population of house sparrows on Hestmannoy in Norway discovered. Having different sized eggs allowed the sparrows to raise successful nestlings, no matter the weather, the researchers found.

Why house sparrows lay both big and small eggs

Why does the egg size of house sparrows vary so much? Isn't it always an advantage to be big?

Thu 9 Aug 18 from Phys.org

Why house sparrows lay both big and small eggs, Thu 9 Aug 18 from Eurekalert

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