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Dugatkin, L. A. (1991). Dynamics of the TIT FOR TAT strategy during predator inspection in the guppy (Poecilia reticulata). Behav. Ecol. Sociobiol., 29(2), 127–132.
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Boyd, L. E. (1991). The behaviour of Przewalski's horses and its importance to their management. Appl. Anim. Behav. Sci., 29(1-4), 301–318.
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Ben-Shahar, R. (1991). Selectivity in large generalist herbivores: feeding patterns of African ungulates in a semi-arid habitat. Afr. J. Ecol., 29(4), 302–315.
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Lucas, Z., Raeside, J. I., & Betteridge, K. J. (1991). Non-invasive assessment of the incidences of pregnancy and pregnancy loss in the feral horses of Sable Island. J Reprod Fertil Suppl, 44, 479–488.
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Garott, R. A. (1991). Sex Ratios and Differential Survival of Feral Hors. J Anim Ecol, 60(3), 929–936.
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Kirkpatrick, J. F., & Turner, J. W. (1991). Changes in herd stallions among feral horse bands and the absence of forced copulation and induced abortion. Behav. Ecol. Sociobiol., 29(3), 217–219.
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Marean, C. W., & Gifford-Gonzalez, D. (1991). Late Quaternary extinct ungulates of East Africa and palaeoenvironmental implications. Nature, 350(6317), 418–420.
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Duncan, I. J., & Petherick, J. C. (1991). The implications of cognitive processes for animal welfare. J. Anim Sci., 69(12), 5017–5022.
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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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Rilling, M. E., & Neiworth, J. J. (1991). How animals use images. Sci Prog, 75(298 Pt 3-4), 439–452.
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