Behavioral responses to acute rabbit odor or cat odor of offspring from dams exposed to distilled water (DW), chronic rabbit urine odor (RO), and chronic cat urine odor (CO) while pregnant (a: hiding; b: alerting; c: foraging; d: grooming; e: exploring; f: others). Data are mean±SEM. Significant differences among vole offspring from different maternal treatments are indicated as follows: *P < 0.05, **P < 0.01. Significant differences between male and female vole offspring are indicated as follows: #P < 0.05.