From that last post, I've started Googling "does Minecraft have insert animal or mythical creature here" non-stop and I'm very surprised by what they don't have. Apparently the reason for not putting in sharks is "they're misunderstood, and we don't want to encourage people to kill sharks", which is fair buuuut... if sharks don't kill people in real life, can't you just make it so that sharks don't kill Steves?