Oh I meant it as a “it exists abundantly, and NPCs spawn with it 100% of the time”. Other Animals ofcourse can exist. XD
And you can always breed those Wolpertingers to get better ones, this isn’t an Issue. Some of them might be more Wooly others more Meaty, and I was also about to say Horny before I realised THAT pun. Kindof like how horses in Minecraft work with their different Stats, but more complicated.
Giant Kashmir Goat Cavalry. Definitely possible. XD
One of the many things I will add before all the RNG stuff is a Model Editor for all the living Stuff that can exist. I’m sure you will be able to make those Goats a reality that way, and just add them to your World.