The shadow on the right appears to be a chimpanzee
We don't actually have any Chimpanzee in the Serengeti. These are all Grants-gazelle, the same muzzle shape and facial marks also on the one standing in right edge.
P.S. These identifying-questions are best and easiest to ask in that blue comment-box below image, so reply can be given directly into image. That way helps also others best, who may classify the same image, when they see original capture and all comments below image 😃