Part a new world I creating (truth is started this map 38 years ago), but as a S&S world the serpent-men ruled the world and mostly still rule 60% of it as their primitive slave rebelled and now control the cooling northern lands (land cooling in thousands of years, compared to millions. )
World of Kar Agath: | Flickr
So the diversity of dino-intellect is as such to far...
Serpent-men - As raptors they have legs and a tail to balance themselves, progressed, and hands to eventually work a type-writer better than me; which works with two fingers...
Snake-men - Well body of snake, arms and upper torso, humanoid. Theory, they never left the jungles and arms for pulling themselves though trees and snake coiling lower body to rap around tree trunks to secure self; whether for hunting or sleeping. There will be a medium and large-sized version.
I also using a more primitive group, which are basically Lizard-men (more related to serpent-men) who have remained savages while the serpent-men became so-called civilized.
I also will be doing the fateful experimentation of the serpent-men to men to make more endurable slaves, which create Hybrid serpent-men, much like Robert E. Howards serpent-men, human bodies and heads of serpents, etc.
Which also creates...
Naga - Head of a human, body of a serpent, large-sized.
Centnaga - top half human, lower half, long serpent tail, large-sized.
So, with different versions of these group, some evolving, some devolving, the hybrid slaves also seeking independence; and fighting their past masters and the primitive humans who now occupy the northern serpent-men cites of the eastern continent on the west coast.
Still working at maps and these idea are going to take years to develop, perhaps another 38 years.