Foraging behaviour in domestic pigs (Sus scrofa): remembering and prioritizing food sites of different value.
Held S, Baumgartner J, Kilbride A, Byrne RW, Mendl M. Foraging behaviour in domestic pigs (Sus scrofa): remembering and prioritizing food sites of different value. Anim Cogn. 2005 Apr; 8(2):114-21.