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References
REFERENCES
Beck, B. Primate tool behavior. In Tuttle, R. H. (ed.), Primate socio-ecology and psychology, pp. 413–447. The Hague: Mouton, 1975.Google Scholar
Beck, B.Predatory shell dropping by herring gulls.Paper presented at the annual meeting of the Animal Behavior Society,Boulder, Colo.,June 1976.Google Scholar