And even then your argument isn't sound, and now you've referenced "several centuries of consistent change." If we start talking about THAT, then every continent in the world has undergone enough "consistent change" over the course of 10-15 centuries that the African continent wouldn't stick out as being significant.
Now that we're fully off topic and just arguing amongst ourselves, how many swallows do you think it would take to carry a coconut from tropical locations to the British Isle?
Or you know, you could just say "this happened in South Africa" instead of "Africa".
and now I've actually become that pain in the ass. Sorry.