When this photograph was taken, Roger Fenton was the official photographer at the British Museum. The human skeleton depicted is of no special significance, apart from the fact that it is probably of a European. The gorilla shows evidence of severe trauma to its left arm, a bite from a lion to the lower part of its left humerus. Gorillas constitute the eponymous genus Gorilla, the largest extant genus of primates by physical size. The closest relatives of gorillas are chimpanzees and humans, all of the Homininae having diverged from a common ancestor about 7 million years ago. Gorillas do not spend much time standing upright because it takes muscle energy for them to do so. The idea behind the presentation is to illustrate that a gorilla standing is not too different from a human standing.