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Alan Grant states that the sight of Tyrannosaurus rex is based on movement. So if you don't move the animal won't see you.

But, as stated (in the second novel) by Richard Levine, this is very unlikely because Many animals (including humans) freeze or play dead when they are scared. If the T. rex wasn't able to see non-moving creatures, it would miss most of its prey.

For a detailed discussion: T. rex' Eyesight Debate on Park Pedia.

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