There are six species of Baboon: 
1. the Olive Baboon (Equatorial Africa), 
2. the Yellow Baboon (Eastern Africa),  
3. the Chacma Baboon (Southern Africa),
4. the Kinda Baboon (Angola, Congo, Zambia),
5. the Guinea Baboon (Western Africa), and 
6. the Hamadryas Baboon (Ethiopia, Somalia and Yemen). 

The largest is the Chacma Baboon (up to 1.2m) and the smallest is the Kinda Baboon (up to 50cm).
Ghana has the Olive Baboon.

The fourth photo clearly shows a male!

Shai Hills Resource Reserve, Accra, Ghana, 26 August 2010

Watch here my video.