LIVE MEGALODON ON CAMERA BRAZIL - real or fake?

billschannel 11 months ago 13 minutes, 33 seconds
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MORE ABOUT MEGALODONS

Megalodon (Carcharocles megalodon), meaning "big tooth," is an extinct species of shark that lived approximately 23 to 2.6 million years ago (mya), during the Early Miocene to the end of the Pliocene. There has been some debate regarding the taxonomy of megalodon: some researchers argued that it was of the family Lamnidae and closely related to the great white shark, while others argued that it belonged to the extinct family Otodontidae; presently, there is consensus that the latter view is correct. Its genus placement, however, is still debated, with authors placing it in either Carcharocles, Megaselachus, Otodus, or Procarcharodon. The shark has made appearances in several media, such as the Discovery Channel's docufiction Megalodon: The Monster Shark Lives.
Scientists suggest that megalodon looked like a stockier version of the great white shark (Carcharodon carcharias), though it may have looked similar to the basking shark (Cetorhinus maximus) or the sand tiger shark (Carcharias taurus). Regarded as one of the largest and most powerful fish to have ever lived, fossil remains of megalodon suggest that this giant shark reached a length of 18 meters (59 ft), though there are many other competing figures due to fragmentary remains; for example, 24 to 25 meters (79 to 82 ft). Their large jaws could exert a bite force of up to 110,000 to 180,000 newtons (25,000 to 40,000 lbf). Their teeth were thick and robust, built for grabbing prey and breaking bone.

Megalodon probably had a profound impact on the structure of marine communities. The fossil record indicates that it had a cosmopolitan distribution. It probably targeted large prey, such as whales, seals, and giant turtles. Juveniles inhabited warm coastal waters where they would feed on fish and small whales. Unlike the great white which attacks prey from the soft underside, megalodon probably used its strong jaws to break through the chest cavity and puncture the heart and lungs of its prey.

The animal faced competition from whale-eating cetaceans, such as Livyatan and ancient killer whales (Orcinus citoniensis), which likely contributed to its extinction. As it preferred warmer waters, it is thought that oceanic cooling associated with the onset of the ice ages, coupled with the lowering of sea levels and resulting loss of suitable nursing areas, may have also contributed to its decline. A reduction in the diversity of baleen whales and a shift in their distribution toward polar regions may have reduced megalodon's primary food source. The extinction of the shark appeared to affect other animals; for example, the size of baleen whales increased significantly after the shark had disappeared.

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