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Antonius O,. (1934). Beobachtungen an Einhufern in Schönbrunn, X. Zebroid und Maulesel, XI. über den zweiten Schönbrunner Maulesel. Zool. Garten., 7, 165–179.
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Zenzinger, S. (2010). Experimentelle Untersuchungen zur optischen Kommunikation bei im Zoo gehaltenen Schabracken- und Flachlandtapiren (Tapirus indicus und Tapirus terrestris). Der Zoologische Garten, 79(4-5), 162–174.
Abstract: Until now, unlike their relatives, rhinos and horses tapirs have received considerably less attention in studies about communication. Therefore, it was the aim of this study to test which stimuli contain optical information for tapirs. For this purpose, the reactions of tapirs on optical stimuli (posters with edited tapir silhouettes) were examined. Research visits took place at the zoos of Berlin, Dortmund, Heidelberg, Munich, Nuremberg and Osnabrück during the year 2006. A total of 23 individuals, thereof 8 (5.3) Malayan tapirs (Tapirus indicus) and 15 (5.10) Lowland tapirs (Tapirus terrestris) attended the experiment. The results of the optical test with variously intense edited tapir silhouettes speak for the importance of the white ear rims as a family specific key stimulus. But that effect could not be amplified by adding a greater extent of white to the silhouette. Tapirs of both species reacted most strongly to the normal tapir silhouette followed by a silhouette without proboscis.
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Antonius. O.,. (1940). Beobachtungen an Einhufern in Schönbrunn. XV. Ein Onagerzebra. Zool. Garten., 12, 161–165.
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Heck L Jr,. (1966). Immobilisation einer Hartmann-Berzebrastute mit Hilfe der Cap Chur Gun im Tierpark Hellabrunn, München. Zool. Garten., 32, 159–162.
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Mohr E,. (). Vom Haflinger Pferd. Zool. Garten., 3, 159–168.
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Antonius O,. (1931). Beobachtungen an Einhufern in Schönbrunn. VI Ein interessantes Ponyfohlen. Zool. Garten., , 158–159.
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LANG EM, L. E. H. M. A. N. N. E. von. (1972). Wildesel in Vergangenheit und Gegenwart. Zool. Garten., 41, 157–167.
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Antonius. O.,. (1937). Über Tiergarten-Exemplare von Equus zebra frederici Trouess. Zool. Garten., 9, 145–149.
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Schäfer E,. (1937). Zur Kenntnis des Kiang (Equus Kiang Moorcraft). Zool. Garten., 9, 122–139.
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Antonius. O.,. (1938). Zur Rückzüchtung des polnischen Wildpferdes. II. Zool. Garten., 10, 102–107.
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