Customisable Calls

It would be nice to be able to choose a call set for each dino, with slight variations of each call. This could cost marks to purchase, or only be selected at the beginning while creating your creature. This could make it so that animals in groups could distinguish one another by sound, and would give some variation to sounds you here.

Another possibility that would be simpler to implement could be a pitch slider, and you can choose how high/low pitched your dino will sound.