Gophers (like the one that shows up with a "message from the underground" for Mufasa) and giant ant-eaters (seen in the pyramid during the "Can't Wait to be King" number) are not native to Africa. It should be noted that Disney prided itself on the wildlife research that went into the production of the movie to make it as realistic as possible, so excusing it as a "cartoon" doesn't work in this case.