We will never know how many different kinds of dinosaurs existed over 160 million years of their existence.
We do know that some fossil remains belong not to dinosaurs but to swimming and flying relatives.
We do know that some fossil remains belong not to dinosaurs but to swimming and flying relatives.
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| Very common dinosaur. In one location,between 1878-81, coal miners in belgium dug up more than 39 Iguanadon skeletons. |
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| Very rare : baryonyx is one of the rarest dinosaurs known. Only one specimen of this hook-clawed carnivore has been found so far. |
Fast runners:
Hypsilophodon, had no armor or sharp, fighting claws. One defense when in danger was to run off on its long,bird like legs. At high speed, Hypsilophodon might have reached speeds of 15 mph (25 km/h).
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