These mostly diurnal primates tend to be social, living in groups ranging in size from 5 to 15 individuals, with an average group size of 5 or 6. These groups usually contain several adults of both sexes. It has been suggested that group size decreases in more humid environments. Foraging often takes place within subgroups of the larger group, and special vocalizations may be used to maintain contact between different subgroups. Interactions between larger groups are rare. Females in the group are dominant over males, giving them advantages in food selection and choice of mates. Grooming other group members is important in the development and maintenance of social bonds. This is true for all prosimians. Crowned lemurs are active from sunrise to sunset, but they will often take a noon break that can last up to four hours. Groups travel after nightfall.