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The cigar shark or Isistius brasiliensis, also known as the cookiecutter shark is a shark that lives deep in the Bermuda Triangle. The animal is capable of devouring prey larger than itself, such as whales, dolphins and other sharks, and it even attacks submarines until they are seriously damaged.
This species of shark is known for carrying out very bold attacks, as described by National Geographic, despite being relatively small, since each specimen measures between 10 and 50 centimeters in length. During the day, it sinks to the depth of the sea, up to 3,600 meters, and at night it rises to the surface to feed.
The name of the species is due to its peculiar way of attacking. The cookiecutter shark has circular teeth with which it tears pieces of meat from its prey. Once the teeth are in, the victim is left with a mark two inches in diameter and seven inches deep, as if someone had “stubbed out a giant cigarette” on the skin. This type of performance generates wear on your teeth, which are replaced on a regular basis.
It is estimated that the cigar shark changes its lower teeth 15 times during its life and, instead of replacing its teeth one by one, they change all its lower teeth from one moment to the next. In turn, it is believed that the fallen teeth are ingested by these sharks, in order to “recover” the calcium.
These sharks are covered in light-producing photophores on the underside, so they glow in the dark. This tactic allows them to attract other predators who, observing the glow in the depths, go to check its origin and, at that moment, the shark attacks them from the side.
Although, because of their size and because they inhabit deep waters, they are considered harmless to humans, these animals often attack submarines. According to the RT portal, they are considered “annoying” due to the damage they can cause to submarines.
Even during 1970, several submersibles of the United States Navy suffered serious damage caused by shark bites in the neoprene covers of the domes of their sonars. The attacks caused leaks of the oil that transmits the sound in the device, which generated a “blindness” in these ships. The situation could be resolved when fiber glass covers were installed around the domes.
During the 1980s, about 30 US submarines were also damaged by cigar bites, which attacked rubber-coated electrical cables.
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Source: La Nacion