If you're a Ghost, either from dying or being an observer and your 'Repsawnability' is on, you can choose to become an Animal.
Unfortunately, there is not much to do, as you can't interact with anything in most cases. Still, you can communicate with other animals, crawl through vents if you're small enough, and go on a grand quest!
You'll usually spawn near a random vent, in Xenobiology, or in someone's office. If you can crawl through vents, they provide a useful means of escape from any pursuer.
Remember, you are just an animal (at least, humans think so).
You must plan your grand overtake of the whole station! The humans will pay for their insolence, bad jokes, and big stompy feet!
You can be instantly killed by pretty much anything. The life of an animal is full of dangers!
Hiding somewhere or behind someone else is your best friend!
Return To The Dead
It's possible to return to ghost form if you happen to get bored or if you're killed.