The movie "Megalodon" in which Li Bingbing participated let many people understand the megalodon for the first time. The film is based on the novel of the same name by American writer Steve Elton, which tells the story of the prehistoric megalodon megalodon shark accidentally escaping from the deep sea to recreate the human race, in order to resolve this catastrophe, human efforts. Through the movie, people usually see the megalodon as a monster similar to Godzilla. In fact, the megalodon is not an illusory science fiction monster, but a real prehistoric shark. And sharks have been competing with other species since the Permian, constantly evolving, and are creatures older than dinosaurs. But now that the numbers are declining year by year, they are gradually being hunted down, and it is gratifying that the protection of whales is now receiving more and more attention.
The following is an introduction to several of the most typical sharks, for you to understand the shark representatives in various geological eras~ ~
<h1>1. Paracynose shark</h1>
The most primitive sharks, living in the Permian, Triassic and Jurassic, can reach more than 15 meters in length, and their teeth are like a saw, which can saw away crustaceans such as ammonites. With the exception of the Jurassic giant dragons, there are no competitors.
Para-spiny shark, image source: Baidu Gallery
<h1>2, Chalky thorn beetle shark</h1>
It was 8-10 meters long and dominated the early Cretaceous period, but was gradually replaced by the dragons that evolved from coastal lizards in the middle and late period, and eventually became the food of large dragons (such as Hoffman dragons, Heynodosaurus).
Chalky shark, image source: Baidu Gallery
<h1>3, Chubut imitates a man-eating shark</h1>
Living in the Eocene, Oligocene, the length is about 12 meters. By this time the dragons had become extinct, the cetaceans had been able to grow, and when the 18-meter-long toothed whale appeared, the sharks were basically at a disadvantage.
Chubut imitates a human-eating shark, image source: Baidu Gallery
<h1>4, megalodon</h1>
It lives in the Oligocene, Miocene, Pliocene and Pleistocene, and is 17 meters long. The megalodon is not as invincible as the movie blows, and it also has competitors, namely the most powerful carnivorous whale in history, the melville whale, which is also 17 meters long.
Megalodon, image source: Baidu Gallery
<h1>5, Great White Shark</h1>
It has lived in the Pleistocene and has a length of up to 6 meters. The only competitor is the 8-meter killer whale. Due to the high intelligence and group collaboration of cetaceans, great white sharks are basically at a disadvantage.
Great White Shark, image source: Baidu Gallery
About the science of sharks, today I will temporarily share with you here, welcome to exchange and add "''