These are the 4 helpers in Health Month. Well, 3 of them are helpers (the Crane, the Fox, and the Polar Bear), and one of them is occasionally grumpy and unhelpful (the Lizard).
The 4 spirit animals will give you bonus points for your rules based on how much you like the rules, how difficult you think they are, and how important they are to you. You specify those qualities when you pick out your rules. Once you choose all of your rules, the spirit animal that likes your rules the most will select you for their team, and this will have a small effect on how things roll during the game.