ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Monolophosaurus dinosaurs mating. Computer illustration of Monolophosaurus sp. dinosaurs mating in a prehistoric landscape. Monolophosaurus were carnivorous theropod dinosaurs that lived during the Middle Jurassic Period (around 176 to 161 million years ago), in what is now North China.
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