In the groove: Scrape marks in ground linked to dinosaurs

January 7, 2016 2:16 PM

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NEW YORK (AP) — Scientists say they've discovered evidence of a frenzied mating ritual by dinosaurs: long grooves in the ground etched by the pawing of clawed feet.

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.

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