Hunters and predators are obvious threats — in each case, something is stalking them, and possibly trying to kill them.
A deer confronted with a car freezes because a car doesn’t *smell* like a predator, it doesn’t *sound* like a predator, and it certainly doesn’t *move* like a predator — so the deer stops to figure out whether it should expend energy to run from danger or stay put and let the strange noisy smelly thing go on its way.
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