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Do sharks get revenge?

Revenge: No shark attacks a human for 'revenge,' but if threatened - like any animal, including humans - it will try to defend itself from injury or death.

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As a shark biologist, I have a hard time imagining sharks doing anything for ‘fun’ – at least in the way that we think of as fun. So, I greatly doubt that any shark would bite a human for such a purpose. As best as we know, sharks have a fairly simply brain, but it is by no means small. The part of the brain dedicated to thinking is relatively small in comparison to mammals and birds; however, they dedicate a lot of neural tissue to interpreting sensory information (smell, sight, hearing, etc), aiding them as predators of big, highly mobile prey. Like many of the lower vertebrates (e.g. bony fishes), sharks seem to work by simple rules – eat, grow, don’t get eaten, mate. They actually have the ability to learn quite quickly and can retain information for prolonged periods of time, which is how many can live to be more than 70 years old in an environment that can rapidly change. If sharks considered humans a viable food item, there wouldn’t be nearly as many people going to the water, and certainly fewer coming out. So clearly, sharks do not consider human part of their diet. Nonetheless, sharks do occasionally bite people; however, we’re not really sure as to why. Shark biologists divide shark-related interactions with humans into two general categories: provoked and unprovoked. The provoked incidents are pretty easy to explain. The person catches, grabs, hugs, chases or taunts the shark, and the shark merely defends itself just like any animal would. The unprovoked incidents are a little more difficult to explain, but motivations could be broken into two general categories: feeding or defense. One possibility is that they mistake people as one of their normal food items, but then decide after biting someone that they aren’t worth actually consuming. Why that is, we’re just not sure. If a shark was starving and mistook a human for a seal or turtle, why won’t they eat the person? We’re still made of proteins, fats and carbohydrates. Maybe we taste bad, don’t taste fishy enough, or simply aren’t fatty enough. Either way, for most of the people who are bitten there is seldom evidence of flesh consumed. Another possibility is that a shark may bite someone because they consider them a threat. Sharks are no different from any other animal, in that they will defend themselves if they are attacked or threatened. So, people may be bitten because the shark feels the person is in their space and thus pose a threat. The person may not even know the shark is there. In most cases, the person who is bitten usually leaves the area (typically as fast as they can), and the threat goes away, so the shark does not pursue. This may also explain why some people are only bitten and not consumed. Some sharks are known to be a bit more cantankerous than others. For instance, I have seen large bull sharks that were caught and tagged along the side of a boat, come back and bite the boat AFTER being released. While it might be hard to call that vengeful, that certainly shows a “don’t screw with me” kind of attitude generally not seen in other species. Tiger and white sharks, despite their “badass” reputation are actually big pussycats when it comes to being caught and tagged.

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Do sharks like the smell of humans?

FICTION: Sharks are attracted to human blood, so if you cut yourself at the beach, you will be attracting sharks. FACT: Sharks know the difference between fish and human blood and, while they can smell our blood, it is not a scent they associate with food.

Top 5 myths about sharks

1. FICTION: Sharks want to eat people.

FACT: We are not on the sharks’ menu. Sharks rarely attack people and would much prefer to eat fish or marine mammals. Millions of people around the world use the oceans every year without incident. In 2018, there were a total of 5 human deaths and 66 unprovoked encounters worldwide. In the U.S., that is less than 0.2 attacks per million people.

2. FICTION: Sharks are the number one cause of animal related deaths.

FACT: On average, sharks kill 6 people a year while mosquitos kill 750,000, snakes kill 100,000, dogs kill 35,000, freshwater snails kill 20,000+, crocodiles kill 1,000, and hippos and elephants each kill about 500.

3. FICTION: Sharks can smell blood a mile away.

FACT: Sharks can smell a drop of blood at a proportion of about one part per 10 billion or about a pinpoint sized drop in an Olympic sized swimming pool. That’s, at most, a distance of a couple of football fields- definitely not a mile. 4. FICTION: Sharks are attracted to human blood, so if you cut yourself at the beach, you will be attracting sharks. FACT: Sharks know the difference between fish and human blood and, while they can smell our blood, it is not a scent they associate with food. Scientific experiments have repeatedly shown that sharks have no interest in human blood.

5. FICTION: All sharks are like great whites.

FACT: There are over 530 species of sharks and only a handful have been responsible for the majority of attacks on humans: great whites, tigers and bull sharks.

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