Zebras have a narrow, mostly vertical black and white striped coat. The patterns of their distinctive stripes are as individual as a human fingerprint. They live in small family groups of four to nine animals, led by a single stallion with one to six mares and their offspring. Males that are not leading a family group form bachelor groups until they establish their own herd. Mares give birth to a single foal after 12 months’ gestation. All species of zebra are closely related to the horse and the ass.