TLW Trek Roar

So...does anyone have a guess as to what dinosaur roared during the island trek in TLW?

I like to believe that it was a large herbivore, like a Mamenchisaurus or Apatosaurus, smallest estimate would be Triceratops and Edmontosaurus. It wasn't harsh and guttural enough to be a T. rex roar, and had a faintly melodious sound to it, like the calls of the herbivores. I also like to think that Roland and Ajay might have seen the animal (a Sauropod or Triceratops), realized that it was large enough to pose a threat if it decided to venture close and moved the group away.