They know the face that feeds them

 作者:聂绍聪     |      日期:2019-03-07 02:17:00
PIGS may be able to tell people apart by their faces. Hajime Tanida of Hiroshima University in Japan trained pigs to approach a person wearing overalls, gloves and boots by rewarding them with food. Individual pigs were then given the choice of approaching the feeder or an identically dressed person, when both sat behind waist-level screens. Even if the researchers’ scents were masked with perfume, or they partially hid their faces, the pigs still approached the original feeder (Applied Animal Behaviour Science, vol 73, p 45). “Visual cues are very important for them,