“…For example, meadow voles, Microtus pennsylvanicus, and golden hamsters, Mesocricetus auratus, both have at least five different sources of individually or sexually distinctive odors (Ferkin & Johnston, 1995a; Johnston, Derzie, Chiang, Jernigan, & Lee, 1993). Animals also use these same signals to identify attributes about individuals, such as their age, sex, reproductive condition, diet, degree of relatedness, and social status (Drickamer, 1989; Eisenberg & Kleiman, 1972; Ferkin & Johnston, 1995a, 1995b; Ferkin, Sorokin, Johnston, & Lee, 1997; Hurst, 1990; Tang-Martinez, Mueller, & Taylor, 1993). In mammals, many of these signals tend to be scents that are deposited by animals as scent marks (Ewer, 1968; Ferkin, Burda, O'Connor, & Lee, 1995; Johnston, 1983; Thiessen & Rice, 1976).…”