Do you know this forest ?
The one where all the animals are reunite to survive.
Eat or be eated is the first rule here, but sometimes, some animals break this basic rule. When it happen, a lot can happen. Well, it is a bit normal when a wolf and rabbits live togheter.
There is also other special places around this forest. For instance, a mountain and a desert. We still do not know how theses habitats can be so near of eachother.
This world is made for feral caracters only.
No humans live here. They are too far from this strange place where animals are sometimes brought here all of sudden. Maybe this place is surrounded by magic? It would be a good theory since some animals have strange colors or even powers.