“…The hypothalamic areas involved in these responses also seem to have a similar role in many different species. These mechanisms have been studied in rats (Adams, Boudreau, Kokonowski, Oberteuffer, & Yohay, 1993; Albert, Nanji, Brayley, & Madryga, 1979; Halász, Liposits, Meelis, et al, 2002; Haller et al 1998; King & Hoebel, 1968; Koolhaas, 1978; Koolhaas & Wiepkema, 1976; Kruk, 1991; Kruk et al, 1979, 1981, 1984, 1998; Lammers, 1988a; Olivier et al, 1990; Panksepp, 1971; Panksepp & Trowill, 1969; Roberts & Nagel, 1996; Roeling, Schuurmans, & Veening, 1993; Vergnes & Karli, 1969, 1970; Woodworth, 1971), golden hamsters (Ferris & Potegal, 1988; Hayden-Hixon & Ferris, 1991), opossums (Adamec, 1990; Roberts, Steinberg, & Means, 1967), cats (Hess, 1928; Hess & Brügger, 1943; Hunsperger, 1956; Katz & Thomas, 1976; Levinson & Flynn, 1965; MacDonnell & Fessock, 1969; Roberts & Bergquist, 1968; Roberts & Kiess, 1964; Siegel et al, 1999; Sledjeski & Flynn, 1972), monkeys (Herndon et al, 1979; Lipp & Hunsperger, 1978), and even domestic fowl (Phillips & Youngren, 1971). Moreover, the same basic principles in hypothalamic behavioral organization seem to apply in these species.…”