Clawmarks in an old riverbed may be evidence of swimming dinosaurs, debunking the long-held belief that the creatures were unable to swim, says a researcher from University of Alberta. Dinosaurs may have deployed something similar to the dog paddle to travel long distances and used their tails to move themselves forward. "It is not a surprise some could swim, but what is significant is that they would swim for quite a while," said Scott Persons, whose findings were published the journal Chinese Science Bulletin.

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