Pigs learn what a mirror image represents and use it to obtain information

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Towards understanding wild boar Sus scrofa movement: a synthetic movement ecology approach (2014, background): “Self-movement cues Evidence of awareness of own movement Domestic pigs Broom et al. (2009)”
Thinking Pigs: A Comparative Review of Cognition, Emotion, and Personality in Sus domesticus (2015, background): “Howell, Toukhsati, Conduit, and Bennett (2013) adapted a similar paradigm to that used by Broom et al. (2009) to dogs and found that more dogs could find the location of hidden food reflected in an angled mirror than those in a control group without a mirror.”
Cognitive ability and awareness in domestic animals and decisions about obligations to animals (2010, background): “Elliker also found, using computer modified photographs, that it was the ear position that was the main feature used by the sheep to make this distinction, rather than eye features.”