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Schoenemann, P. Thomas (2004). "Brain Size Scaling and Body Composition in Mammals". Brain, Behavior and Evolution. 63 (1): 47–60. doi:10.1159/000073759. PMID14673198. S2CID5885808.
Broom, D. M.; Sena, H.; Moynihan, K. L. (2009). "Pigs learn what a mirror image represents and use it to obtain information". Animal Behaviour. 78 (5): 1037–1041. doi:10.1016/j.anbehav.2009.07.027. S2CID53175225.