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Klingel, H. (1998). Observations on social organization and behaviour of African and Asiatic Wild Asses (Equus africanus and Equus hemionus). Appl Anim Behav Sci, 60(2), 103–113.
Abstract: 1This paper appears with kind permission of Verlag Paul Parey, Berlin and Hamburg. It was originally published in Z. Tierpsychol., 44, 323-331 (1977), ISSN 0044-3573/ASTM-Coden: ZETIAG.1
Abstract
African and Asiatic Wild Asses (Equus africanus and Equus hemionus) live in unstable groups or herds of variable composition. Some of the adult stallions are territorial in large territories in which they tolerate other ♂♂. The territorial ♂♂ are dominant over all their conspecifics
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Mench, J. A., Morrow-Tesch, J., & Chu, L. - R. (1998). Environmental enrichment for farm animals. Lab Anim., 27, 32–36.
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Zohary, D., Tchernov, E., & Horwitz, L. K. (1998). The role of unconscious selection in the domestication of sheep and goats. J Zool, 245.
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Whiten, A. (1998). Imitation of the sequential structure of actions by chimpanzees. J Comp Psychol, 11.
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Breitenmoser, U. (1998). Large predators in the Alps: the fall and rise of man's competitors. Biol Conserv, 83.
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Gese, E. M., & Ruff, R. L. (1998). Howling by coyotes (Canis latrans): variation among social classes, seasons, and pack sizes. Can J Zool, 76.
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Peters, G., & Tembrock, G. (1998). Subharmonics, biphonation, and deterministic chaos in mammal vocalizations. Bioacoustics, 9.
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(1998). Animal Acoustic Communication: Sound Analysis and Research Methods. Berlin: Springer.
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Nissen, J. (1998). Enzyklopädie der Pferderassen. Stuttgart: Kosmos.
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Harman, A. M., Moore, S., Hoskins, R., & Keller, P. (1999). Horse vision and an explanation for the visual behaviour originally explained by the 'ramp retina'. Equine Vet J, 31(5), 384–390.
Abstract: Here we provide confirmation that the 'ramp retina' of the horse, once thought to result in head rotating visual behaviour, does not exist. We found a 9% variation in axial length of the eye between the streak region and the dorsal periphery. However, the difference was in the opposite direction to that proposed for the 'ramp retina'. Furthermore, acuity in the narrow, intense visual streak in the inferior retina is 16.5 cycles per degree compared with 2.7 cycles per degree in the periphery. Therefore, it is improbable that the horse rotates its head to focus onto the peripheral retina. Rather, the horse rotates the nose up high to observe distant objects because binocular overlap is oriented down the nose, with a blind area directly in front of the forehead.
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