Photo: Ben Phillips

What is the biggest shark ever existed on earth?

megalodon megalodon, (Carcharocles megalodon), member of an extinct species of megatooth shark (Otodontidae) that is considered to be the largest shark, as well as the largest fish, that ever lived.

britannica.com - Megalodon | Size, Fossil, Teeth, & Facts - Encyclopedia Britannica

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Physical features

Megalodon was the largest fish ever known, a designation based on discoveries of hundreds of fossil teeth, two vertebral columns, and a handful of individual vertebrae. Tooth-shape similarities between megalodon and modern great white sharks (Carcharodon carcharias) suggest that the two species may have been close relatives, and thus megalodon likely resembled that species in appearance—that is, as a bulky torpedo-shaped fish with a conical snout, large pectoral and dorsal fins, and a strong crescent-shaped tail. Estimates of body length are calculated using the statistical relationship between the size of megalodon’s fossil teeth and the teeth and body mass of modern white sharks and other living relatives. This data suggests that mature adult megalodons had a mean length of 10.2 metres (about 33.5 feet), the largest specimens measuring 17.9 metres (58.7 feet) long. Some scientists, however, contend that the largest forms may have measured up to 25 metres (82 feet) long. Studies estimate that adult body mass ranged from roughly 30 metric tons (1 metric ton = 1,000 kg; about 66,000 pounds) to more than 65 metric tons (about 143,000 pounds), adult females being larger (in both length and mass) than adult males. Megalodon teeth are similar to those of modern white sharks in that they are triangular, serrated, and symmetrical. They differ from modern white shark teeth in that they are larger and thicker, the serrations on each tooth occur in regular intervals, and they possess a bourlette (a darker, chevron-shaped region near the tooth’s root). The largest extant megalodon tooth measures 17.8 cm (6.9 inches) in length, almost three times longer than those of modern white sharks (which are typically about 5.4 cm [2.1 inches] long). In addition, megalodon possessed a ferocious bite; its bite diameter was 3 metres (about 9.8 feet), several times larger than the bite diameter of averaged-sized white sharks.

Britannica Quiz Understanding Megalodon

Megalodon is thought to have managed its body temperature in a manner similar to that of modern white sharks, in that it was not exclusively cold-blooded like most fish. White sharks generate heat through the contraction of their swimming muscles, and this heat raises the temperature of parts of the shark’s body above that of the surrounding water, an adaptation called regional endothermy (which is a type of warm-bloodedness). This adaptation might have allowed megalodon to swim and hunt in colder waters, giving it exclusive access to prey in those locations.

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Do sharks like death metal?

Great whites are supersensitive to low-frequency vibrations, which they use to detect shoals of fish, so the thumping, rumbling tones and beats of death metal are perfect for the sharks to pick up on. This isn't the first time great white sharks have been known to like their music a little heavy.

iflscience.com - Great White Sharks Like Heavy Metal Music | IFLScience

Thrashing yet graceful, aggressive yet misunderstood – if one species in the animal kingdom is a metalhead, it would have to be the great white shark. A documentary film crew found that blasting death metal tunes into the water can actually help attract great white sharks. Filming for the Shark Week show “Bride of Jaws,” the Discovery Channel film crew used a military underwater speaker to pump out heavy metal in the sea to try to attract a 4.8 meter (16 foot) shark, awesomely known as “Joan of Shark.” They didn’t attract Joan, however they did entice two others to come up to the boat, one of which was over 4.2 meters (14 feet) long. Sharks feel the vibrations of sound waves through their lateral line , a sense organ that runs through their head right down the side of their body to their tail fin. Great whites are supersensitive to low-frequency vibrations, which they use to detect shoals of fish, so the thumping, rumbling tones and beats of death metal are perfect for the sharks to pick up on. This isn’t the first time great white sharks have been known to like their music a little heavy. A few years ago, an Australian shark tour operator, found out AC/DC songs had a similar effect .

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