CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
Dinosaurs at a kill. Computer artwork of a Daspletosaurus (centre) defending its kill from a pair of scavenging Troodon dinosaurs. It has killed a Triceratops, a large herbivorous dinosaur. These dinosaurs inhabited what is now North America in the late Cretaceous period, around 75 million years ago. Daspletosaurus was a huge predatory dinosaur, which could reach a length of 9 metres. Troodon was much smaller, and probably hunted smaller herbivores in packs, and scavenged from the kills of larger dinosaurs.
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