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Veen, P., Jefferson, R., de Smidt, J., & van der Straaten, J. (2009). Grasslands in Europe of high nature value. The Netherlands: Brill.
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Byrne R.W. (1994). The evolution of intelligence. In P.J.B. Slater and T.R. Halliday (Ed.), Behaviour and Evolution (pp. 223–265). Cambridge,UK: Cambridge University Press.
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Ruid, D. B., Paul, W. J., Roell, B. J., Wydeven, A. P., Willging, R. C., Jurewicz, R. L., et al. (2009). Wolf-Human Conflicts and Management in Minnesota, Wisconsin, and Michigan. In A. P. Wydeven, T. R. Van Deelen, & E. J. Heske (Eds.), Recovery of Gray Wolves in the Great Lakes Region of the United States: An Endangered Species Success Story (pp. 279–295). New York, NY: Springer New York.
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McCoy, D. E., Schiestl, M., Neilands, P., Hassall, R., Gray, R. D., & Taylor, A. H. (2019). New Caledonian Crows Behave Optimistically after Using Tools. Current Biology, .
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d'Ingeo, S., Quaranta, A., Siniscalchi, M., Stomp, M., Coste, C., Bagnard, C., et al. (2019). Horses associate individual human voices with the valence of past interactions: a behavioural and electrophysiological study. Scientific Reports, 9(1), 11568.
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Irving-Pease, E. K., Ryan, H., Jamieson, A., Dimopoulos, E. A., Larson, G., & Frantz, L. A. F. (2019). Paleogenomics of Animal Domestication. In C. Lindqvist, & O. P. Rajora (Eds.), Paleogenomics: Genome-Scale Analysis of Ancient DNA (pp. 225–272). Cham: Springer International Publishing.
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de Oliveira, K., Soutello, R. V. G., da Fonseca, R., Costa, C., de L. Meirelles, P. R., Fachiolli, D. F., et al. (2015). Gymnastic Training and Dynamic Mobilization Exercises Improve Stride Quality and Increase Epaxial Muscle Size in Therapy Horses. Journal of Equine Veterinary Science, 35(11), 888–893.
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Young, R. J. (2003). Environmental Enrichment for Captive Animals.
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Niederhöfer, S. (2009). Stressbelastung bei Pferden in Abhängigkeit des Haltungssystems. Ph.D. thesis, Tierärztliche Hochschule Hannover, Hannover.
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