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Male Dinosaur, or Female? For One Creature, There's a Clue

For extinct creatures like dinosaurs known only from fossils, it is notoriously difficult to differentiate the males from the females of a species because sex distinctions are rarely obvious from the skeletons. But in the case of the well-known Jurassic dinosaur Stegosaurus, a study published Wednesday may provide a handy how-to guide on telling the boys from the girls based on the shape of the big, bony plates protruding from its back. Stegosaurus, which roamed the western United...

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