It's often the case that a bizarre fossil discovery, especially of a 75-million-year-old dinosaur, can't be fully understood without additional context. While Therizinosaurus was finally identified as some kind of theropod dinosaur in Mongolia, 1970, it wasn't until the discovery of the closely related Segnosaurus and Erlikosaurus that it was finally identified as a "segnosaurid," a bizarre family of theropods possessing long arms, gangly necks, pot bellies, and a taste for vegetation rather than meat.
The most striking feature of Therizinosaurus was its claws—sharp, curved, three-foot-long appendages that looked like they could easily disembowel a hungry raptor or even a good-sized tyrannosaur. Not only are these the longest claws of any dinosaur (or reptile) yet identified, but they're the longest claws of any animal in the history of life on earth—even exceeding the gigantic digits of the closely related Deinocheirus, the "terrible hand."
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