The Barbary Macaque (Macaca sylvanus) is a macaque with only a stub of a tail. Found in the Atlas Mountains of Algeria and Morocco with a small, possibly introduced, population in Gibraltar, the Barbary Macaque is one of the best-known Old World monk

The Barbary Macaque is a gregarious monkey, forming mixed groups of several females and males; the troop of 10 to 30 individuals is matriarchal, with its hierarchy determined by lineage to the lead female. Unlike other macaques, the males participate in rearing the young; much time is spent playing and grooming with them. In this way, a strong social bond is formed between a male and his offspring, both the male’s own and those of others in the troop. This may be a result of selectiveness on the part of the females, who seem to prefer highly parental males. The mating season runs from November through March. After a gestation period of 147 to 192 days, typically one baby per female is born; twins are a rarity. The monkeys reach maturity at 3 to 4 years of age, and may live for 20 years or more.