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Orlov Vn,. (1968). Equus Hemionus Pall. Geograficeskaja Sbornik trudov zool MGU, 10, 37–52.
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Orlov Vn,. (1968). Veränderungen am Schädel von E. hemionus Pall und zur Frage der Evolution der Pferde.
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Rossdale Pd,. (1968). Abnormal perinatal behaviour in the thoroughbred horse. Brit Vet J., 124, 540–553.
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Rossdale Pd,. (1968). Perinatal behaviour int the thoroughbred horse. (Vol. Chapt. 15).
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Tembrock G,. (1968). Land mammals. (pp. 338–404).
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Urban Ek, B. L. (1968). Wildlife in an ethiopian valley. Oryx, 9, 342–353.
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Zeeb K,. (1968). Paarungsverhalten von Rind und Pferd im Herdenverband. Z Tierzüchtung Züchtungsbiol, 84, 229–235.
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Neville, M. K. (1968). Male leadership change in a free-ranging troop of Indian rhesus monkeys (Macaca mulatta). Primates, 9(1), 13–27.
Abstract: The male leadership of a troop of rhesus living at the foot of the Kumaon foothills of India was studied from January to December of 1965. The troop, inhabiting a region of fields and forests, varied in size from a maximum of 20 after the birth season to a minimum of 14 in December during the breeding season. The troop initially contained two adult males with the occasional presence of a third, more peripheral male. This third male disappeared in March and was perhaps identical with the male who began to appear in August and succeeded in displacing the dominant male from the troop. The second initial male succeeded to the dominant position in September. During the breeding season various extra-troop males followed and occasionally penetrated the troop. The second male had difficulty in maintaining his position against one of these, who had perhaps been the peripheral male at the beginning of 1965.
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Klingel, H. (1968). Sozial Organisation und Verhaltensweisen von Hartmann- und Bergzebras (Equus zebra hartmannae und E. z. zebra). Z. Tierpsychol., 25, 76–88.
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Salzen, E. A., & Cornell, J. M. (1968). Self-perception and species recognition in birds. Behaviour, 30(1), 44–65.
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