Egg tossing (behavior)
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Egg tossing is a behavior observed in some species of birds and is related to infanticide. The activity is performed so as to increase the chances that newly laid eggs which are genetically closer to the female receive a better chance of survival. This behavior is often seen in species that exhibit cooperative breeding.
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Egg tossing by brood parasites
A slightly different behavior is that of brood parasite birds, such as some species of cuckoos: the cuckoo chick may toss host's eggs and even host's chicks out of the nest.
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