The next morning, you feel kind of strange. You try to stand up, which is oddly difficult. And, your perspective is oddly strange. It takes you a while - either you think it's a dream, or it's difficult to see yourself, or there just isn't a conveniant pool of water nearby - but you suddenly realise that something is really wrong.
Why? You're an animal.
What kind of animal? Well, that's up to you.
PS. All visiting muses from other museboxes will also be turned into animals upon entering the jungle.