Parent blue-footed boobies suppress siblicidal behavior of offspring

@article{Lougheed1999ParentBB,
  title={Parent blue-footed boobies suppress siblicidal behavior of offspring},
  author={Lynn W. Lougheed and D. John Anderson},
  journal={Behavioral Ecology and Sociobiology},
  year={1999},
  volume={45},
  pages={11-18}
}
Abstract Behaviorally dominant nestlings routinely kill sibling nestmates in blue-footed booby (Sula nebouxii) broods during periods of food shortage. Previous work demonstrated that these dominant, first-hatching “A-chicks” regulate the lethality of their behavior towards subordinate, second-hatching “B-chicks,” showing tolerance towards B-chicks except during chronic food shortages. Siblicide by A-chicks usually occurs after the hatchling stage. Results of an interspecific cross-fostering… 
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Brood reduction through siblicide in this species is a two‐phase process: eviction from the nest area, followed by death from predation, exposure or starvation, which is uniquely confined to this species within the Stercorariidae.
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It is presented the first examples of deadly conflict between siblings of different cohorts in Galápagos fur seals and sea lions, where up to 23% of all pups are born while the older sibling is still being nursed.
Response to begging calls by Zebra Finch parents: "first come, first served" rule may overcome a parental preference between chicks.
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