Most howler monkey species live in groups of 10 to 15 animals, with one to three adult males and multiple females. Mantled howlers monkeys (Alouatta palliata) are an exception, commonly living in groups of 15 to 20 individuals with more than three adult males. Unlike most New World monkeys, in which one sex remains in natal groups, juveniles of both sexes emigrate from their natal groups,[4] such that howler monkeys could spend the majority of their adult lives in association with non-kin.
Physical fighting among group members is infrequent and generally of short duration. However, serious injuries can result. Both males and females may fight with each other but physical aggression is even more rare between sexes.[4][5] Group size varies by species and by location, with an approximate male to female ratio of a male to four females.
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