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Zentall, T. R., & Hogan, D. E. (1978). Same/different concept learning in the pigeon: the effect of negative instances and prior adaptation to transfer stimuli. J Exp Anal Behav, 30(2), 177–186.
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Zentall, T. R., & Hogan, D. E. (1975). Key pecking in pigeons produced by pairing keylight with inaccessible grain. J Exp Anal Behav, 23(2), 199–206.
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Shettleworth, S. J. (1985). Handling time and choice in pigeons. J Exp Anal Behav, 44(2), 139–155.
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Wasilewski, A. (2003). “Freundschaft” bei Huftieren? – Soziopositive Beziehungen zwischen nicht-verwandten artgleichen Herdenmitgliedern. Doctoral thesis, , . Retrieved October 20, 2018, from http://archiv.ub.uni-marburg.de/diss/z2003/0639/
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R. A. Hopkins. CALIFORNIA WILDLIFE HABITAT RELATIONSHIPS SYSTEM (Vol. M174). Retrieved October 20, 2018, from http://www.dfg.ca.gov/bdb/cwhr/lha/lha_M174.pdf
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Wakeling, E. (2002). Feral Horses of the West. Retrieved October 20, 2018, from http://web.archive.org/web/20050206074127/http://www.personal.psu.edu/users/e/n/enw107/
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Alverdes, F. (1925). Tiersoziologie. Leipzig: C. L. Hirschfeld,.
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Antonius, O. Zur Frage der Zähmung des Onager bei den alten Sumerern. l., , 477–484.
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Antonius O,. (1933). Bemerkungen über Bastarde und Bastardzucht. Biologica Generalis, 9, 39–47.
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Cheney D.L., & Seyfarth, R. M. (1990). How monkeys see the world: Inside the mind of another species. Chicago: University of Chicago Press.
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