Scientists Discover New Dinosaur with Dangerous Tail
2021-12-08
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1Scientists in Chile have discovered the bones of a dinosaur they say used its unusual tail as a deadly weapon.
2Researchers say the dog-sized creature had a tail weapon unlike those seen on any other animal.
3The tail had a series of "blades" on each side that could be used to cut its enemies.
4At first, the scientists thought the plant-eating dinosaur might have belonged to a similar species called stegosaurus.
5But after studying pieces of skull and examining DNA, the scientists decided the dinosaur must be from a new species.
6The researchers named the dinosaur stegouros because of its similarities to stegosaurus.
7The find is described in a study recently published in Nature.
8Alex Vargas was the lead writer of the study.
9He told The Associated Press that the animal's blade-like tail could be used as a cutting weapon similar to those used by Aztec warriors.
10"It's a really unusual weapon," said Vargas, a scientist with the University of Chile.
11He said information on the species should be added to books on prehistoric animals for children.
12"It just looks crazy," Vargas added.
13The bones, or fossil, is from about 72 million to 75 million years ago, the team said.
14Researchers believe the animal is part of the ankylosaur family of dinosaurs.
15They are believed to have walked the Earth throughout the Jurassic and Cretaceous periods.
16The scientists say the dinosaur must have been a rare southern hemisphere member of the family.
17Vargas called it "the lost family branch of the ankylosaur."
18The fossil appears to be an adult based on the way the bones are connected, Vargas said.
19It was found with its front end flat on its stomach.
20The back end sat at a lower level, almost as if caught in sand, he added.
21The tail was probably used as a defense against large predators.
22Vargas said the animal's enemies were also likely persuaded not to attack by armor-like bones that made stegouros "chewy."
23Not only is this "a really bizarre tail," but it is from far southern Chile, said Macalester College biologist Kristi Curry Rogers.
24She was not part of the study.
25Rogers said discoveries of that kind of animal have not been made in the area before.
26She added that the finding shows that scientists are "just scratching the surface" when it comes to understanding the many different kinds of dinosaur species.
27"Stegouros reminds us that if we look in the right places at the right times, there is so much more still to discover."
28I'm Bryan Lynn.
1Scientists in Chile have discovered the bones of a dinosaur they say used its unusual tail as a deadly weapon. 2Researchers say the dog-sized creature had a tail weapon unlike those seen on any other animal. The tail had a series of "blades" on each side that could be used to cut its enemies. 3At first, the scientists thought the plant-eating dinosaur might have belonged to a similar species called stegosaurus. But after studying pieces of skull and examining DNA, the scientists decided the dinosaur must be from a new species. 4The researchers named the dinosaur stegouros because of its similarities to stegosaurus. 5The find is described in a study recently published in Nature. Alex Vargas was the lead writer of the study. He told The Associated Press that the animal's blade-like tail could be used as a cutting weapon similar to those used by Aztec warriors. 6"It's a really unusual weapon," said Vargas, a scientist with the University of Chile. He said information on the species should be added to books on prehistoric animals for children. "It just looks crazy," Vargas added. 7The bones, or fossil, is from about 72 million to 75 million years ago, the team said. Researchers believe the animal is part of the ankylosaur family of dinosaurs. They are believed to have walked the Earth throughout the Jurassic and Cretaceous periods. 8The scientists say the dinosaur must have been a rare southern hemisphere member of the family. Vargas called it "the lost family branch of the ankylosaur." 9The fossil appears to be an adult based on the way the bones are connected, Vargas said. It was found with its front end flat on its stomach. The back end sat at a lower level, almost as if caught in sand, he added. 10The tail was probably used as a defense against large predators. Vargas said the animal's enemies were also likely persuaded not to attack by armor-like bones that made stegouros "chewy." 11Not only is this "a really bizarre tail," but it is from far southern Chile, said Macalester College biologist Kristi Curry Rogers. She was not part of the study. Rogers said discoveries of that kind of animal have not been made in the area before. 12She added that the finding shows that scientists are "just scratching the surface" when it comes to understanding the many different kinds of dinosaur species. "Stegouros reminds us that if we look in the right places at the right times, there is so much more still to discover." 13I'm Bryan Lynn. 14The Associated Press reported this story. Bryan Lynn adapted the report for VOA Learning English. Susan Shand was the editor. 15____________________________________________ 16Words in This Story 17dinosaur - n. a very large animal that used to live millions of years ago 18blade - n. the flat part on a knife or similar tool or weapons 19species - n. a group of animals or plants that are similar and can produce young animals or plants 20predator - n. an animal that hunts and kills other animals for food 21chewy - adj. needing to be chewed a lot before being swallowed 22bizarre - adj. very strange and surprising 23scratch the surface - phr v. to deal with only a small part of a subject or problem 24remind - v. make someone think of something they have forgotten about