Lithium Eaters aren't meant to look human. (I say this as their creator.)
|I allow them to be bipedal so they look more human, allowing fans to feel like they have something in common with them, so when you do see them die in war you feel sorry for the poor guys; it also gives the film a more serious tone.|
And what makes you think that big cats aren't serious?
Felysians can and do walk bipedally, if being formal. But there are so few opportunities for them to do so. Also, Lithium Eaters aren't Felysians.
|There's a video were actually a felysian stands on two feet as well as lithium eater you can see it in the previous page I think it was said by raptorjedi|