Gorilla gorilla gorilla
Western lowland gorillas are the largest of the great apes. They are sexually dimorphic with males weighing on average 374 pounds and females weighing on average 154. Adult males are called silver-backs due to a streak of silver hair that runs the length of their back from their shoulders to rump. Adult males also have a prominent sagittal crest, a large protrusion on the top of their head which is made of the skull, connective jaw muscles and fatty tissue. Gorillas have dark brown to black hair and black skin, with bare faces, hands, feet and chests.
The population is estimated at 130,000, although it is declining due to human induced habitat loss and degradation, disease, and hunting for the bushmeat trade.