Therizinosaurus juvenile The Therizinosaurus juvenile is a harmless herbivore but has long, razor-sharp claws. The Therizinosaurus juvenile is a harmless herbivore but has long, razor-sharp claws. Why just use them for eating? The naughty young animal is made for fighting! It much prefers fighting in heated battles with dinosaurs his own age. Would it win in a fight against a T.rex juvenile? Its definitely brave enough! Fun fact The Therizinosaurus juvenile is a wily one.