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           In The Groove: Scrape Marks in Ground Linked to Dinosaurs

   by Associated Press

   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.

   Some birds show that behavior now, and the researchers believe the
   discovery shows that two-legged, meat-eating dinosaurs did it about 100
   million years ago.

   Martin Lockley of the University of Colorado Denver said the dinosaurs,
   probably males, apparently gathered and scraped the ground with their
   three-toed feet. The grooves are up to 6 feet long.

   Lockley is an author of a paper released Thursday by the journal
   Scientific Reports.

   Thomas Holtz Jr. of the University of Maryland, who didn't participate
   in the work, agreed that dinosaurs probably made the marks. But he said
   he's not convinced they did it for mating.
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   [1]http://www.voanews.com/content/in-the-groove-scrape-marks-in-ground-
   linked-to-dinosaurs/3135072.html

References

   1. http://www.voanews.com/content/in-the-groove-scrape-marks-in-ground-linked-to-dinosaurs/3135072.html