Ferriss S, Robbins MM & Williamson EA (2005) Eastern gorilla (Gorilla beringei). In: Caldecott J & Miles L (eds.) World Atlas of Great Apes and their Conservation. Berkeley, Los Angeles, London: University of California Press, California/UNEP World Conservation Monitoring Centre, pp. 129-152. http://www.unep-wcmc.org/resources/publications/WAGAC/launch.htm
First paragraph: Eastern gorillas (Gorilla beringei Matschie, 1903), occur in the wild more than 1 000 km from the nearest western gorillas (G. gorilla Savage, 1847). They are larger than the western gorilla but otherwise similar, with a broad chest and shoulders, a large head, and a hairless, shiny black face. A full-grown adult male can weigh up to about 220 kg, and a full-grown adult female about half this.46, 97, 99 Two subspecies of eastern gorilla are currently recognized by the Primate Specialist Group of IUCN–The World Conservation Union:48 the eastern lowland or Grauer’s gorilla (G. b. graueri Matschie, 1914); and the mountain gorilla (G. b. beringei Matschie, 1903).
; Gorilla; Social behavior in animals; Endangered species; Gorilla behavior; Apes Conservation