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Shark attacks in the Egyptian resort town Sharm el-Sheikh have left four swimmers injured and one dead in the past week. In this case, with photographic evidence.A Experts think they've determined that the same oceanic white tip shark was responsible for two of the attacks because photographs taken prior to and during both attacks reveal an animal with matching bodily markings.
The case of the oceanic white tip in Egypt A is highly unusual: Generally experts are left grasping at straws and can do no more than figure out the species of the attacker and not the appearance of the individual shark.
Examination of the bite wound itself can be more useful, because shark teeth differ widely from species to species. Of course, if scientists can get their hands on part of the actual tooth, that's even more revealinga€”a sort of bingo moment in establishing what species of shark inflicted the bite. If scientists manage to identify the species of shark responsible for the attack, there is actually very little they can do with that information, besides to enter it into a database such as the International Shark Attack File, which tracks shark-attack trends for scientific purposes. Though historically the response to shark attacks has been martiala€”fishermen go out and try to capture or kill sharks in the area, in hopes of preventing another attacka€”scientists nowadays consider that sort of witch hunt a fool's errand that only promotes a false sense of safety.

Explainer thanks Chris Lowe of the California State University Long Beach Shark Lab, George Burgess, curator of the International Shark Attack File, and John McKosker of the California Academy of Sciences.
There's no way to track the shark down, but scientists do have a clear idea of what it looks like and could presumably identify it if they happened upon it.
Since photographic evidence is rare, experts fall back on eyewitness reports (detailing the shark's size, color, and markings)a€”which are notoriously unreliable.
And in fact, it's not uncommon for a shark's teeth to break off mid-bite; sharks are cartilaginous creatures, and their teeth aren't rooted in bone like humans' are.
In most cases, how could fishermen possibly know that they've caught the right shark or that the shark they've caught is more likely to attack than any other shark? People who end up in close proximity to a shark tend to greatly overestimate the animal's size.
The way that the victim's flesh is torn surrounding the points of incision can indicate the motion the shark used while biting; some sharks, particularly smaller ones, have the flexibility to vigorously shake their heads while attacking.

Scientists suggest focusing not on shark behavior, which we don't understand very well, but on human behavior, which we do.
To make matters worse, 85 percent of people attacked by sharks never see the shark that bit them. Examining the bite marks, as well as the places where shark teeth scraped on human bone, can reveal whether the teeth had smooth or serrated edges.
A more enlightened response is to close the beaches for a few days following the attack and to educate beachgoers on ocean safety. Besides, the myth of the rogue, man-eating shark has gone out of fashion.A  Even Peter Benchley, the author of the book Jaws, admitted late in life that he had done a disservice to sharks in portraying them as monstrous villains.

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