FACT FRIDAY: Piglets can distinguish between their own mother’s voice and that of other sows.

Fraser AF and Broom DM. 1990. Farm Animal Behaviour and Welfare, 3rd Edition (London, U.K.: Baillière Tindall, p. 236).
Houpt KA. 2005. Domestic Animal Behavior for Veterinarians and Animal Scientists, 4th Edition (Ames, IA: Blackwell Publishing, p. 188).