Perks you could unlock that have no associated stat changes purely serving to make creature's more personal.
;1 Metriacanthosaurus drooling like a komodo dragon
;2 Eotriceratops with a broken horn
;3 Deinocheirus with a pelican-like gullet
;4 Struthiomimus with a more 'skittish' idle animation
;5 Sarcosuchus with a small Oxpecker landing in the mouth when Sleeping (purely cosmetic, not an actual AI, think like the butterflies or the fish)
Since these require a lot of work to implement, they could be really expensive perks, showing a player's dedication to a specific playable and giving them something to work towards after they manage to get their desired skins / combat perks.