New theory, A scrab may, or may not have ears, I don't know. But if they don't, take Xavier's example:
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When you run while a scrab is'nt " looking " at you, he turns on and starts running after you
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Now could this be because the scrab can pick up vibrations from the ground? And when you stop, it's still following you because it also has infa-red sensors in that little half-oval thing on the top of it's head, which is probobly how they communicate, using their breath to send heat signatures to each other. They know when to jump gaps, because their's either extreme " coldness " in the pit, or it's because they copy their prey's movements while running.
Just a thought.