Part of Science Fiction is engaging our sense of wonder. What if something familiar was just a little bit different? Alien wildlife is an engaging way to engage our sense of wonder. Making new alien wildlife is difficult and simple at the same time. Changing its skin covering, eye count, mouth structure, and limbs are easy, but when you're on the spot or have done it a few times recently it can be tricky.
Here, I present a list of Cat aliens. They're numbered for easy reference, as well as for use with random generators. Each space cat is different, and while they might specialize for an ecology or have additional capabilities, they should all be recognizable as "cats". They do tend towards wild versions of the creatures: its conceptually easier to convert a wild animal into a domestic one than vice versa. I should give credit to Mailanka for inspiring this with his post about Space Cats. I hope you find enjoyment and inspiration in this list!