What are you plans for creatures? Do you mocap animals?

It depends. There's many different ways you can do it. Traditional animators say its better to do everything by hand, especially if you're going for a stylized look, but on a project like this you have to take a look at practicality and what works best time wise. If you wanted to mo-cap a centipede that would be fascinating to watch, but you just have to take some shortcuts that look the same, but underneath allow you to create less work for yourself.