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The head of Therizinosaurus Therizinosaurus was an unusual theropod—one that was probably not carnivorous, but herbivorous—from the Late Cretaceous. It had a small head with a toothless beak. Its long neck, broad, heavy body and relatively short tail were all covered with feathers. Therizinosaurus’s feathers might have been both for body insulation and for display during mating. It had short, four-toed feet. Therizinosaurus's most distinctive feature was the presence of three gigantic finger-claws, gently curved, flat-sided and tapering. The longest of these was one metre (more than 3 feet) long.

Beipiaosaurus, a therizinosaur dinosaur from the Early Cretaceous of China. It measured 2.2 m (7.3 ft) in length.
Therizinosaurus egg

Fossil studies

Therizinosaurus means “scythe lizard”, after its immensely long claws. Its skull has never been discovered. Reconstructions have been based on the skulls of related species. Therizinosaurus and its relatives, all of which looked like giant, flightless birds with outsize claws, were probably the most unusual dinosaurs ever discovered. 

Therizinosaurus's claws are the longest of any animal that ever lived.

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