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Albentosa, M. J., Kjaer, J. B., & Nicol, C. J. (2003). Strain and age differences in behaviour, fear response and pecking tendency in laying hens. Br Poult Sci, 44(3), 333–344.
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Aronson, L. (1998). Animal behavior case of the month. Aggression directed toward other horses. J Am Vet Med Assoc, 213(3), 358–359.
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Atock, M. A., & Williams, R. B. (1994). Welfare of competition horses. Rev Sci Tech, 13(1), 217–232.
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Bachmann, I., Audige, L., & Stauffacher, M. (2003). Risk factors associated with behavioural disorders of crib-biting, weaving and box-walking in Swiss horses. Equine Vet J, 35(2), 158–163.
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Baker, K. C., Seres, E., Aureli, F., & De Waal, F. B. (2000). Injury risks among chimpanzees in three housing conditions. Am. J. Primatol., 51(3), 161–175.
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Collery, L. (1974). Observations of equine animals under farm and feral conditions. Equine Vet J, 6(4), 170–173.
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Cooper, J. J., & Mason, G. J. (1998). The identification of abnormal behaviour and behavioural problems in stabled horses and their relationship to horse welfare: a comparative review. Equine Vet J Suppl, (27), 5–9.
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Curtis, S. E., & Stricklin, W. R. (1991). The importance of animal cognition in agricultural animal production systems: an overview. J. Anim Sci., 69(12), 5001–5007.
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Freire, R., Wilkins, L. J., Short, F., & Nicol, C. J. (2003). Behaviour and welfare of individual laying hens in a non-cage system. Br Poult Sci, 44(1), 22–29.
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Fuentes, A., Malone, N., Sanz, C., Matheson, M., & Vaughan, L. (2002). Conflict and post-conflict behavior in a small group of chimpanzees. Primates, 43(3), 223–235.
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