Scientists have discovered the fossilized remains of a new long-necked, long-tailed dinosaur that has taken the crown for largest terrestrial animal with a body mass that can be accurately determined.
Measurements of bones from its hind leg and foreleg revealed that the animal was 65 tons, and still growing when it died in the Patagonian hills of Argentina about 77 million years ago.
“To put this in perspective, an African elephant is about five tons, T. rex is eight tons, Diplodocus is 18 tons, and a Boeing 737 is around 50 tons,” said study author and paleontologist Kenneth Lacovara at Drexel University. “And then you have Dreadnoughtus at 65 tons.”
Dreadnoughtus, meaning “fears nothing,” is named after the impervious early 20th century battleships. Although it was a plant-eater, a healthy Dreadnoughtus likely had no real issues with predators due to its intimidating size and muscular, weaponized tail.
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