A baboon who acted as assistant to a disabled railway signalman in South Africa

Jack (died 1890) was a chacma baboon, who attained some fame for acting as an assistant to a disabled railway signalman in South Africa. Jack was the pet and assistant of double leg amputee signalman James Wide, who worked for the Cape Town–Port Elizabeth Railway service. [2] To assist in performing his duties, Wide purchased the baboon named Jack and trained him to push his wheelchair and to operate the railways signals under supervision.

Source: en.wikipedia.org