“…While I have argued that olfactory communication via urine marking in rats serves a sexual advertisement function (Brown, 1977(Brown, , 1986, other researchers have suggested that urine marking is a response to novelty (Hopp & Timberlake, 1983), a response to the familiarity of nonsexual social odors (Birke & Sadler, 1984), or a mechanism for advertising the reproductive state of the individual (Lee, Mitchell, & Adams, 1984). Socially experienced male rats mark more than do isolates (Experiment 2 of the present study), dominant males mark more than do subordinates (Adams, 1976), sexually aroused males mark more than do nonaroused males (Brown, 1986), and estrous females mark more than do diestrous females (Birke, 1978); these differences may reflect different levels of self advertisement.…”