August 3, 2008 by devtaliaferro
Reasons for attacks
While one should be very cautious with great white sharks, it does not target humans as prey.
There are many theories about why sharks sometimes attack people.[12] Sharks are apex predators in their enviroment, and thus have little fear of any creature they cross paths with. Like most sophisticated hunters, they are curious when they encounter something unusual in their territories. Lacking any limbs with sensitive digits such as hands or feet, the only way they can explore an object or organism is to bite it. Generally, shark bites are exploratory, and the animal will swim away after one bite (unfortunately, a single bite can greviously injure a human if the animal involved is a powerful predator like a Great White or Tiger shark).
Most sharks would not waste energy attacking a human with the intention of eating them, as our ratio of bone-to-muscle makes us extremely hard to eat for a creature with no leverage (in open water, with nothing to prop a large prey item up against and no grasping limbs that could hold it still, it is quite difficult to remove flesh from bones using only their mouth).
Some species, such as the great white shark, may sometimes mistake humans for seal or other prey animal; this would be typical when a shark attacks a surfer. The shape of a surfer lying on a board closely resembles a seal from beneath the surface (seals have a thick layer of energy-rich fat, which makes them very attractive targets). Another theory is that sharks normally make one swift attack and then retreat to wait for the victim to die or exhaust itself before returning to feed. This protects the shark from injury from a wounded and aggressive target; however, it also allows humans time to get out of the water and survive.
Sharks are equipped with sensory organs that detect the electricity generated by muscle movement; another theory for the low fatality rate of shark bites is that the electrical receptors, which pick up movement, do not pick up the same signals from a human as they do a wounded seal (which creates a disturbance in the water similar to a human swimming), and so they are more cautious[citation needed].
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August 3, 2008 by devtaliaferro
Statistics
In 2000, there were 79 shark attacks reported worldwide, 11 of them fatal. In 2005 and 2006 this number dropped to 61 and 62 respectively, while the number of fatalities dropped to only four per year. Of these attacks, the majority occurred in the United States (53 in 2000, 40 in 2005 and 38 in 2006).[1] For the same period, the Global Shark Attack File records 69 unprovoked attacks of which five were fatal.[2]
The Florida Museum of Natural History points out that these numbers should be compared with the much higher deaths from other, less feared causes; for example, several hundred people die annually from lightning strikes.[3] It should also be noted that the relatively low number of shark attacks on humans is dwarfed by the number of sharks fished by humans, amounting to almost 40 million per year.[4]
The New York Times reported in July 2008 that there had been only one fatal attack in the previous year.[5]
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August 3, 2008 by devtaliaferro
Dolphins’ protection
There are many stories that tell of dolphins protecting humans from shark attacks, with multiple eye-witness accounts from survivors dating from antiquity to present day (typically, dolphins form a ring around humans who are injured or endangered). This phenomenon was declared “plausible” by the team of Discovery Channel’s Mythbusters, where it was shown that a shark will attack no creature when a dolphin is around. However, in spite of years of scientific study, there has been no conclusive explanation given for this behavior. In some cases, sharks have been seen attacking, or trying to attack dolphins.
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August 3, 2008 by devtaliaferro
A 28-year-old jogger was killed and dismembered by an alligator in Florida.
“The alligator attacked her and basically amputated her arms, bit her on the leg and back and pulled her into the water,” he told reporters. “She died extremely fast. By the time she was pulled into the water, she was already dead.” No eyewitnesses have come forward, although one woman said she thought she saw Ms Jimenez dangling her feet in the water.
Thankfully aligator attacks on humans in Florida are rare with only 18 people being killed since records began in 1948.
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