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".
Cleveland Metroparks Zoo
Opened originally as the Primate & Cat Building in 1975, the Primate, Cat & Aquatics Building houses one of the largest collections of primate species in North America, including western lowland gorillas, New World monkeys, aye-ayes, and several species of lemur. However, the building does not house the Zoo's entire primate population; numerous primate species can also be found in the RainForest. In 1985, the Cleveland Aquarium permanently closed and donated its collection of exotic fishes and invertebrates to the Metroparks Zoo. A section of the Primate & Cat building was renovated to accommodate the new Aquatics section, which currently features 35 salt- and freshwater exhibits including a variety of sharks, piranhas, a giant Pacific octopus, electric eels, and hundreds of living coral.