“…The importance of caregiver recognition in the establishment of later social relationships has been described in several species including several birds (Fabricius, 1991;Immelmann, 1975;Lorenz, 1970;Ten Cate, 1985;Vos, 1995), rats (Fillion & Blass, 1986;Moore et al, 1996); sheep and goats (Kendrick et al, 1998;Kendrick, Haupt, Hinton, Broard, & Skinner, 2001); and nonhuman primates (Fujita, 1993;Kellogg, 1968). Cross-fostering studies in many species of birds (Fabricius, 1991;Immelmann, 1975;Lorenz, 1970;Ten Cate, 1985;Vos, 1995), and between sheep and goats FIGURE 4 Partner preference in male rats with and without sexual experience following neonatal handling.…”