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This undated photo provided in January 2016 by Dr. Martin Lockley shows him, right, and co-author Ken Cart beside two large Cretaceous-age scrapes from western Colorado that are the first physical-reported evidence that large theropod dinosaurs engaged in courtship behavior. The scientists who discovered the long grooves say they were dug by the feet of dinosaurs during a frenzied ritual to attract mates. Such behavior is seen nowadays in some birds, and the discovery suggests that two-legged, meat-eating dinosaurs called theropods did it about 100 million years ago, the researchers said in a report released Thursday, Jan. 7, 2016. (Courtesy of Martin Lockley via AP)

This undated photo provided in January 2016 by Dr. Martin Lockley shows him, right, and co-author Ken Cart beside two large Cretaceous-age scrapes from western Colorado that are the first physical-reported evidence that large theropod dinosaurs engaged in courtship behavior. The scientists who discovered the long grooves say they were dug by the feet of dinosaurs during a frenzied ritual to attract mates. Such behavior is seen nowadays in some birds, and the discovery suggests that two-legged, meat-eating dinosaurs called theropods did it about 100 million years ago, the researchers said in a report released Thursday, Jan. 7, 2016. (Courtesy of Martin Lockley via AP)

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