 However, it is the only subspecies that occurs mainly in the rainforests of central and western Africa with an annual rainfall around 1,500 mm.The African forest buffalo is a small subspecies of the African buffalo.Cape buffalo weigh anywhere from 400 to 800 kg (880–1760 lbs), whereas African forest buffalo are much lighter, weighing in at 250 to 320 kg (550–705 lbs).