Do common ravens yell because they want to attract others?

@article{Heinrich2004DoCR,
  title={Do common ravens yell because they want to attract others?},
  author={Bernd Heinrich and John M. Marzluff},
  journal={Behavioral Ecology and Sociobiology},
  year={2004},
  volume={28},
  pages={13-21}
}
SummaryThe formation of groups at food bonanzas results from a variety of mechanism, which include recruitment by signalling and information parasitism. Recruitment is distinguished from information parasitism on functional grounds: attraction of a crowd is termed recruitment if the signaler's fitness is enhanced by the attraction of others but termed parasitism if the signaler's fitness is reduced by the attraction of others. We here show, however, that in Common Ravens, Corvus corax, the… 

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