A female mouse may spawn as many as ten litters of eight to ten young during her lifetime–which generally is less than a year. The gestation period is three weeks, and the young mice reach maturity in only ten weeks.

The mane of the male lion is a distinctive characteristic of lions as no other big cats have them. It makes male lions appear larger, thus allowing them to be more intimidating. It also signals sexual maturity and health status; lionesses tend to favour denser and darker manes.