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Ruckebusch Y,. (1972). The relevance of drowsiness in the circadian cycle of farm animals. Anim Beh, 20, 637–643.
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Spinage Ca,. (1972). African ungulate life tables. Ecology, 53, 645–652.
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Spinage Ca,. (1972). Age estimation of zebra. E Afr Wildl J, 10, 273–278.
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Young E, P. B. (1972). The reaction of the Cape Mountain Zebra(E. Zebra Zebra) to certain chemical immobilisation drugs. Koedoe, 15, 95–96.
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Amsterdam BK. (1972). Mirror self-image reactions before age two. Dev. Psychol., 5, 297.
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Zentall TR, & Levine JM. (1972). Observational learning and social facilitation in the rat. Science, 178, 1220.
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Rowell, T. E. (1972). Social Behavior of Monkeys.
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GINTHER OJ et al,. (1972). Characteristics of estrus, diestrus and ovulation in mares and effects of season and nursing. Am J Vet Res, 33, 1935–1939.
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Klingel H,. (1972). The behavior of horses (Equidae). Handb. Zoolog., 8, 1–68.
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Joubert, E. (1972). Mountain zebra behaviour. Zool. Afr., 7.
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