Diana monkey Cercopithecus diana
![Diana monkey Cercopithecus diana natural history illustration by Lizzie Harper](https://lizzieharper.co.uk/wp-content/uploads/2018/04/diana-monkey-336x525.jpg)
Pen and ink illustration of the Diana monkey Cercopithecus diana with tail hanging down and one arm extended
Pen and ink illustration of the Diana monkey Cercopithecus diana with tail hanging down and one arm extended