What characteristic is common among solitary primates?

High sexual dimorphism is characteristic of many solitary primates. This characteristic refers to significant differences in size or appearance between males and females of a species. In solitary primate species, males are often larger than females, which can be attributed to various evolutionary pressures, such as competition for mates. Larger males may have advantages in asserting dominance and accessing female partners, which directly relates to reproductive success.

This characteristic contrasts with social primates, which typically exhibit less sexual dimorphism, as the social structures in these species often require more uniformity in size for cohesion and cooperative behaviors. In solitary primates, the absence of social bonding or group dynamics allows sexual dimorphism to have a more prominent role in mating strategies.

The other options are associated with more social species or configurations, highlighting the significant differences in behavior and physical traits between solitary and social primates.