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Wasserman, E. A. (1997). The science of animal cognition: past, present, and future. J Exp Psychol Anim Behav Process, 23(2), 123–135.
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Marino, L. (2002). Convergence of complex cognitive abilities in cetaceans and primates. Brain Behav Evol, 59(1-2), 21–32.
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Lachapelle, S., & Healey, J. (2010). On Hans, Zou and the others: wonder animals and the question of animal intelligence in early twentieth-century France. Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences, 41(1), 12–20.
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Köhler, W. (1921). Intelligenzprüfungen an Menschenaffen. Berlin: Springer.
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Ducoing, A. M., & Thierry, B. (2005). Tool-use learning in Tonkean macaques (Macaca tonkeana). Anim. Cogn., 8(2), 103–113.
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Santos, L. R., Pearson, H. M., Spaepen, G. M., Tsao, F., & Hauser, M. D. (2006). Probing the limits of tool competence: experiments with two non-tool-using species (Cercopithecus aethiops and Saguinus oedipus). Anim. Cogn., 9(2), 94–109.
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Pennisi, E. (2006). Animal cognition. Social animals prove their smarts (Vol. 312).
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Straub, A. (2007). An intelligent crow beats a lab. Science, 316(5825), 688.
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Pepperberg, I. M. (2002). The value of the Piagetian framework for comparative cognitive studies. Anim. Cogn., 5(3), 177–182.
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Morell, V. (2007). Nicola Clayton profile. Nicky and the jays (Vol. 315).
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