This shows the stereo photograph as a 3-D anaglyph – you will need a pair of red-blue anaglyph glasses to see the image in three dimensions.

Hottot's pet monkey Bikoko. In November 1908, while Hottot was away on his third expedition, Bikoko escaped his cage in an incident reported in the local French press: 'Cette semaine toute la police municipale a été mobilisé par un singe.'
Rueil, France. Circa 1909.

Pitt Rivers Museum 1994.62.421