Baryonyx, bar ree ON ihks was a large dinosaur that may have eaten mostly fish. It measured over 30 feet (9 meters) long and weighed about 2 tons (1.8 metric tons). The dinosaur walked on two powerful hind legs, using its long tail for balance. Baryonyx's name means heavy claw or strong claw. This name describes large curved claws on the animal's thumbs. The claws grew to a length of about 1 foot (0.3 meter).