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".
Denver Zoo
Primate Panorama spreads over and primarily houses apes and other larger primates. Tree-dwelling apes and monkeys live in open-air wire mesh tents that soar four stories high and cover more than an acre of ground. Inside these tents, primates like De Brazza's monkeys, colobus monkeys and red-capped mangabeys can play and climb on twisting vines. Western lowland gorillas roam freely, climbing ropes and taking afternoon hammock naps in one of the largest gorilla habitats in the world. Sumatran orangutans have their own outdoor habitat where they can climb trees and swing in hammocks.