(10 feet) long, they were considered the longest arms of any dinosaur and any creature ever found. When a single claw of a Therizinosaurus was first discovered sometime in the 1950's by paleontologists, the claw itself was so extraordinary that the paleontologists originally believed it to have been a single rib bone that belonged to a giant turtle, possibly Archelon. But sometime later, it was discovered that the claws were actually attached to a dinosaurs's arms.
In fact, when they were first discovered, they were thought to be ribs of a giant tortoise, and were recognized as claws only later. long and were the biggest known claws of any animal after the less-known Deinocheirus. The claws that Therizinosaurus possessed could be as long as 70 cm-1.5 m. Over 12 meters long and 7 meters high, and weighing up to 9 tons, Therizinosaurus lived in the Gobi Desert, Mongolia, Asia. 2.2 Walking with Dinosaurs: Inside Their World.
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