Lemurs are primates but developed quite differently from monkeys and apes when Madagascar split from the African continent millions of years ago. Ring-tailed lemurs are unique from other lemurs in that they prefer walking on the ground to swinging through trees. Social and territorial animals, they live in groups of about 12 to 25. The females are in charge and get the best food. Ring-tailed lemurs are endangered largely because the sparse dry forests they love are quickly vanishing. Lemurs life span in captivity is 20-25 years a vast improvement from the 14-16 years in the wild.