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Beran, M., & Rumbaugh, D. (2001). “Constructive” enumeration by chimpanzees (Pan troglodytes) on a computerized task. Anim. Cogn., 4(2), 81–89.
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Wittig, R. M., & Boesch, C. (2003). “Decision-making” in conflicts of wild chimpanzees (Pan troglodytes): an extension of the Relational Model. Behav. Ecol. Sociobiol., 54(5), 491–504.
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Krueger, K. (2010). “Erfasst” das Pferd die menschliche Psyche". In M. Dettling, C. Opgen-Rhein, & M. Kläschen (Eds.), Pferdegestützte Therapie bei psychischen Erkrankungen (pp. 40–51). Stuttgart: Schattauer Verlag.
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Wasilewski, A. (2003). “Freundschaft” bei Huftieren? – Soziopositive Beziehungen zwischen nicht-verwandten artgleichen Herdenmitgliedern. Doctoral thesis, , .
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Nguyen, N., Van Horn, R., Alberts, S., & Altmann, J. (2009). “Friendships” between new mothers and adult males: adaptive benefits and determinants in wild baboons (Papio cynocephalus). Behav. Ecol. Sociobiol., 63(9), 1331–1344.
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Pepperberg, I. M. (2004). “Insightful” string-pulling in Grey parrots (Psittacus erithacus) is affected by vocal competence. Anim. Cogn., 7(4), 263–266.
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Keil, N. M., Sambraus, H.H. (1998). “Intervenors” in agonistic interactions amongst domesticated goats. Z. Säugetierk., 63(5), 266–272.
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Perner J, & Wimmer H. (1985). “John thinks that Mary thinks that”: attribution of second-order beliefs by 5- to 10-year-old children. J. Exp. Child Psychol., 39, 437.
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Birke, L. (2007). “Learning to speak horse”: The culture of “natural horsemanship”. Society and Animals, 15(3), 217–239.
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van Dierendonck, M. (2015). “Out of the box” – innovations and new developments in social housing for horses. In K. Krueger (Ed.), Proceedings of the 3. International Equine Science Meeting. Proc. 3. Int. Equine. Sci. Mtg. Wald: xenophon Publishing.
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