User blog comment:The Reptile King/Hybrid Dino Creation center/@comment-28358106-20160701234515/@comment-27950421-20160702013347

Well the reptile kingdom is just that, a kingdom of reptiles not a prehistoric realm. All reptiles can be found there but ither stuff is a rarity. The reason why it's so heavy in paleo reptiles right now is because 1) reptiles were at their most diverse back during the paleozoic and mesozoic. So it's easy to get lots of uniquely mamono from that. 2) I'm a huge paleo nerd. I don't have to research a lot of this stuff.

I wouldn't be opposed to a prehistoric realm of mamono that include the paleo reptile mamono I've made but the non reptilian paleo mamono wouldn't be found in the kingdom. Non reptilian mamono are a minority and are all immagrants. There is some non Reptilian wild life, but the vast majority of the ecosystem is comprised of reptiles.