What is Ndume studying?

You may be wondering why Ndume is studying what looks like a bowling ball. But Ndume is not a bowler, and that is an “enrichment ball” — a large hollow ball, containing some of Ndume’s favorite food treats, accessible only through a couple of holes (which are not large enough for Ndume’s fingers) — hence the challenge. But Ndume always finds a way; he’s a very resourceful guy.