By Victoria GillScience reporter, BBC News
Scientists have digitally reconstructed the scene of a dinosaur chase - preserved in the mud of an ancient river bed in Texas.
The tracks were left by two dinosaurs more than 110 million years ago.
Seventy years ago, the whole trackway was removed from the river bed and divided into blocks, which were moved to different locations for study.
Some of these blocks have been lost, but the team managed to use old photographs to reconstruct the site.
The research is published in the journal Plos One.
Lead researcher Peter Falkingham, from the Royal Veterinary College, said he and his colleagues had used just 17 photographs taken by American palaeontologist Roland T Bird, who first excavated the site in 1940.
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