Therizinosaurus was a colossal therizinosaur that could grow up to 9–10 m (30–33 ft) long and weigh possibly over 3 t (3,000 kg). Like other therizinosaurs, it would have been a bit of a slowpoke on the ground. These fellows had a rhamphotheca (horny beak) and a wide torso for food processing.
The forelimbs were particularly robust and had three fingers that bore unguals which, unlike other relatives, were very stiffened, elongated, and only had significant curvatures at the tips. After years of taxonomic debate, nevertheless, they are now placed in one of the major dinosaur clades, Theropoda, specifically as maniraptorans.
