There's supposedly a wall there that stops the big carnivores from invading, but that begs the question of how the big herbivores got through (such as Littlefoot's grandparents).
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They're 4-legged, they can balance better.
shareI see no evidence of anything stopping the carnis from entering. It's doesn't really matter does it? All dinos were extinct (except some relatives that lives on today).
The film just tells this group of dinosaurs story of getting to the valley, and leave it at that.
obviously, littlefoot and friends stop them. didn't you see the sequel where they designate themselves as guardians of the great valley and go around killing the rest of the sharpteeth?
share