If your preschooler has just started knowing the difference between domestic and wild animals, then these printables would help to increase their vocabulary even more. The older kids would also benefit since they can learn about advanced animal categories like those indigenous to the continents of Africa and Australia, and even those who have ceased existing on earth.
You could go a step further by making a chart of these lists, with pictures to support each one of them. This would for sure make learning easier and better.