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Bates, L. A., Lee, P. C., Njiraini, N., Poole, J. H., Sayialel, K., Sayialel, S., et al. (2008). Do Elephants Show Empathy? J Conscious Stud, 15(10-11), 204–225.
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Menke, C., Waiblinger, S., Fölsch, D. W., & Wiepkema, P. R. (2008). Social Behaviour and Injuries of Horned Cows in Loose Housing Systems. Anim Welfare, 8(3), 243–258.
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