The graboids did not travel to other continents in our time. They are an ancient life form and “moved” only as continental drift connected different land masses in the past. South America and Africa were connected millions of years ago, for example, and shared life forms then. We’re probably stretching the rules of biology a bit, here, but hey, they’re our monsters! As for why graboids attack certain locations, they are simply predators attracted to noise and vibrations. If you make noise, they attack. So it’s really a matter of being unlucky enough to be near where they are.
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