“…Mirror-image stimulation (MIS), that is, "situations in which an animal is confronted with its reflected image" (Gallup, 1968, p. 782), has been featured in numerous analyses of motivational and social phenomena in animals, for example, social facilitation in birds and rodents (e.g., Hamrick, Cogan, & Woolam, 1971), visual reinforcement and aggression in birds and fish (e.g., Cohen & Looney, 1973;Davis, Harris, & Shelby, 1974;Dore, Lefebvre, & Ducharme, 1978;Gallup & Capper, 1970), tonic immobility and egg-laying in birds Lott & Brody, 1966), and social responsiveness in rodents (Svendsen & Armitage, 1973). These studies indicate that MIS has social-stimulus properties (see Gallup, 1968), and the more recent studies also demonstrate differing reactions to mirrors and other individuals.…”