Footprints tell a story: These dinosaurs were social

Four parallel paths of dinosaur footprints - which include 70 footprints of a small type of didactyl (a two-toed dinosaur) called Deinonychus - provide the first evidence that the creatures lived in groups, according to an article published in Cretaceous Research on Monday.

Authors of the article were from China, the United States, Canada, Australia, South Korea and Germany.

The four parallel sets of footprints represent some of the more than 300 dinosaur footprints found at a 6,000-square-meter site in Lizhuang village of Tancheng county, Linyi city, Shandong province.