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Virga, V., & Houpt, K. A. (2001). Prevalence of placentophagia in horses. Equine Vet J, 33(2), 208–210.
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Houpt, K. A., & Feldman, J. (1993). Animal behavior case of the month. Aggression toward a neonatal foal by its dam. J Am Vet Med Assoc, 203(9), 1279–1280.
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Houpt, K. A., & Smith, R. (1993). Animal behavior case of the month. J Am Vet Med Assoc, 203(3), 377–378.
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Lees, P., & Tavernor, W. D. (1970). Influence of halothane and catecholamines on heart rate and rhythm in the horse. Br J Pharmacol, 39(1), 149–159.
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Alexander, F., & Nicholson, J. D. (1968). The blood and saliva clearances of phenobarbitone and pentobarbitone in the horse. Biochem Pharmacol, 17(2), 203–210.
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de Waal, F. B., Aureli, F., & Judge, P. G. (2000). Coping with crowding. Sci Am, 282(5), 76–81.
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de Waal, F. B., & Berger, M. L. (2000). Payment for labour in monkeys. Nature, 404(6778), 563.
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de Waal, F. B. (1999). The end of nature versus nurture. Sci Am, 281(6), 94–99.
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Parr, L. A., & de Waal, F. B. (1999). Visual kin recognition in chimpanzees (Vol. 399).
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de Waal, F. B. (1995). Bonobo sex and society. Sci Am, 272(3), 82–88.
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