I asked a guy who is really into ghosts why there aren't dinosaur ghosts. I've always wanted to know.

Dinosaurs left no unfinished business.

I understand that a ghost exists only for a limited amount of time, before the soul involved takes another incarnation. Basically, methinks the same principle would apply to pre-human evolutionary forms too.

What if there are but only dinosaurs can see them? Might be why chickens are so crazy.