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Beran, M. J., Beran, M. M., Harris, E. H., & Washburn, D. A. (2005). Ordinal judgments and summation of nonvisible sets of food items by two chimpanzees and a rhesus macaque. J Exp Psychol Anim Behav Process, 31(3), 351–362.
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Petherick, J. C., Seawright, E., & Waddington, D. (1993). Influence of motivational state on choice of food or a dustbathing/foraging substrate by domestic hens. Behav. Process., 28(3), 209–220.
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Macphail, E. M., & Boldhuis, J. J. (2001). The evolution of intelligence: adaptive specializations versusgeneral process. Biological Reviews, 76(3), 341–364.
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Güntürkün, O., & Kesch, S. (1987). Visual lateralization during feeding in pigeons. Behav. Neurosci., 101(3), 433–435.
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Hockenhull, J., & Creighton, E. (2010). Unwanted oral investigative behaviour in horses: A note on the relationship between mugging behaviour, hand-feeding titbits and clicker training. Appl. Anim. Behav. Sci., 127(3-4), 104–107.
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de Waal, F. B. M. (2005). How animals do business. Sci Am, 292(4), 54–61.
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de Waal, F. B. (1997). Food transfers through mesh in brown capuchins. J Comp Psychol, 111(4), 370–378.
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Jackson, R. R., & Li, D. (2004). One-encounter search-image formation by araneophagic spiders. Anim. Cogn., 7(4), 247–254.
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Goncalves, T. C., Rocha, D. S., & Cunha, R. A. (2000). Feeding patterns of Triatoma vitticeps in the State of Rio de Janeiro, Brazil. Rev Saude Publica, 34(4), 348–352.
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Brosnan, S. F., & de Waal, F. B. M. (2004). A concept of value during experimental exchange in brown capuchin monkeys, Cebus apella. Folia Primatol (Basel), 75(5), 317–330.
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