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Baryonyx had a large claw on the thumb of each hand, which measured about 31 cm (12 in) long. Its long neck was not as strongly S-curved as in the theropods and the skull was at an acute angle, not the 90° angle common in many theropods. It had a very crocodilian jaw containing a total of 96 teeth. The lower jaw held 64 teeth, and the upper jaw had 32 large teeth. A few years after the English discovery, a partial skull of Baryonyx was found in the Spanish Sala de los Infantes deposit. Some of the famous dinosaur fossil tracks of La Rioja, near Burgos, have since been identified as tracks of Baryonyx, or at least a theropod dinosaur very similar to it.
Baryonyx appears to have been up to 10 m ( 33 ft) long , and around 3.5 m (12 ft) tall and probably weighed around 2,000 kg (5,000lb). Interestingly bone analysis of the most complete specimen shows it was not yet fully grown, so Baryonyx may have grown even larger.
WHAT ROCKS WAS IT FOUND IN?
Baryonyx was found in Cretaceous sedimentary rocks which have been interpreted to have been a delta of the huge Wealden Lake which covered the majority of what is now northern Europe.
Because a number of fossilised scales and bones from the fish Lepidotes were discovered in the body cavity of the English specimen it has been claimed that Baryonyx ate fish. Its crocodile-like jaws and large number of finely serrated teeth are also claimed as consistent with Baryonyx eating fish. Therefore it was further speculated that Baryonyx would sit on a riverbank, rest on its powerful front legs, and then sweep fish from the river with its powerful striking claw in a similar way to a present day brown bear. BUT since bones of a the land dwelling dinosaur Iguanodon were also found in association with Baryonyx, it has been suggested that Baryonyx scavenged any meat it could find. Until the discovery of the similar dinosaur Suchomimus, Baryonyx was the only suspected piscivorous or fish-eating dinosaur,