Egg tossing (behavior)
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.
Among colonial non-co-nesting birds egg-tossing is observed to be performed by conspecific (of the same species) intruders. The tossing observed was non-accidental: the intruder rolled the egg to the edge of the nest by repeatedly flicking it with its beak.
It was concluded that in some species of cooperative birds egg-tossing is a strategy of clutch coordination: eggs are tossed until all birds in the common nest are ready to proceed with brooding, so that early egg-layers do not dominate the reproduction. 
Egg tossing by brood parasites
- "Cooperative Breeding in Birds: Long Term Studies of Ecology and Behaviour" (1990) Peter B. Stacey, Walter D. Koenig (eds.), ISBN 0-521-37890-7
- Charles R. Brown, Mary Bomberger Brown (1996) "Coloniality in the Cliff Swallow: The Effect of Group Size on Social Behavior", ISBN 0-226-07625-3, p. 142
- Walter D. Koenig, Janis L. Dickinson (2004) "Ecology and Evolution of Cooperative Breeding in Birds", ISBN 0-521-53099-7, p. 91
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