Dinosaurs put best foot forward for mating

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.

Martin Lockley of the University of Colorado Denver said the dinosaurs, probably males, apparently gathered in groups and "went crazy scraping" with their clawed, three-toed feet to attract mates.