Social Enhancement of Food Preferences in Norway Rats: A Brief Review11Some portions of this article have appeared previously in Galef, B. G., Jr. (1994). Olfactory communications about foods among rats: A review of recent findings. In B. G. Galef, Jr., M. Mainardi, and P. Valsecchi (Eds.), Behavioral Aspects of Feeding (pp. 83–102). Chur, Switzerland: Harwood Academic Publishers.