Unless you see the shark, see the wound immediately, or find tooth fragments in bone, it's really hard to identify the exact species after swelling and the natural puckering of sutures take hold. Even sand tiger teeth can grate across the skin upon release, making a puncture with a scratch resemble a deep laceration in a photo.
We can certainly rule out some species, but when it comes down to identifying the bite of one of the smaller, more common species, it's simply a best guess situation.
(I still believe that if the tourists knew how many large tiger sharks are right outside those breakers, most would visit the Smokies!)
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