The FLYERS weren't seperated.
I honestly can't believe I didn't see this before, but you know how all the dinosaur "families" are seperated from each other right? So the children have to go to the Great Vally on their own?
Well what was seperating them all was basically a massive drop in the ground - couldn't the "Flyers" just fly over this and meet up again? I know that not all of them can fly yet, but those ones could just get the ones who can to help them across.
I love this film and HATE to find flaws in films I love so much, but I had to point this out. Thoughts?