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" ... It sounds like an easy problem to solve: just look at the track, count the toes, and measure the overall shape of the foot. If the track had 5 toes, it probably came from an ornithopod forefoot; 4 toes probably meant a rare print from a theropod forefoot; and 3 toes could have been a hind foot from either type of dinosaur. So how did track A2 turn into a mystery that took half a century to solve? ... "