Mean time (s) ± SEM that LP male voles not treated with melatonin, LP male treated with melatonin, LP female voles not treated with melatonin, LP female voles treated with melatonin, SP males, and SP females spent self-grooming when they were exposed to bedding scented by LP males, LP females, SP males, and SP females. A two-way ANOVA was used to test for significant differences in the amount of time self-grooming across each odor condition (α ≤ 0.05). Histograms capped with different letters indicate significant difference between odor conditions (Holm-Sidak test, p <0.05).