Therizinosauridaes

This family of strange, mysterious theropods was notable for their long necks and their large claws. However, unlike most other theropods, they were herbivores (or at least primarily). Some of them may have had feathers. The genus that the family is named after, Therizinosaurus, is actually only known from a few fossils, but its claws were quite large, likely reaching a meter in length.