Eastern gorilla
Grauer's gorillas and mountain gorillas were previously thought to be two of the three subspecies of one single species, the gorilla ("Gorilla gorilla"). However, genetic research has shown that the two eastern subspecies are far more closely related than the western subspecies: the western lowland gorilla ("G. gorilla gorilla"), which justified the separate classification. The two eastern subspecies are now classified as "G. beringei".
Primate Sociality
Primate Sociality is characterized by its complexity and the diverse social behaviors exhibited by members of different species, including humans. Nearly all primates are social animals and live in organized social networks, which are believed to have originated as a means to better locate food sources. Most group orientated primates follow a maternal lineage likely due to the tendency for females to remain in clustered groups, while males roam more freely in search of potential mates. However, patterns of mating, grouping and interpersonal relationships are diverse among primate species. Research on species in the great apes family, namely gorillas, bonobos, orangutans, and chimpanzees are most well understood because of their strong genetic similarity to humans. It has been shown that great ape species exhibit diversity in social interactions. For instance, chimpanzees exhibit strong aggressive tendencies and male dominance, whereas bonobos engage in female power sharing and less aggression . Furthermore, the great ape species share similarities to complex behaviors to humans, such as conforming to social norms, social play, and self-recognition. Primate species outside of the great ape family have also been observed to exhibit complex social behaviors. For instance, squirrel monkeys have demonstrated social learning behaviors, whereas howler monkeys have been observed to participate in group coordination..This demonstrates that complexity of social behaviors is observed in many primates, not only to those in the great ape family.