Shell dropping by northwestern crows: a reexamination of an optimal foraging study
Plowright, R.C.; Fuller, G.A.; Paloheimo, J.E. (1989). Shell dropping by northwestern crows: a reexamination of an optimal foraging study. Can. J. Zool. 67(3): 770-771
In: Canadian Journal of Zoology = Revue canadienne de zoologie. National Research Council: Ottawa. ISSN 0008-4301; e-ISSN 1480-3283, meer
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