FRIEDRICH SAURER / SCIENCE PHOTO LIBRARY FRIEDRICH SAURER / SCIENCE PHOTO LIBRARY
Utahraptor dinosaur, artwork. Utahraptor ostrommaysorum are dromaeosaurs and thought to have been an extremely lethal group of dinosaurs because of the 'killer claws' on their feet. Utahraptor was the tallest of the dromaeosaurs which include Velociraptor and Dromaeosaurid. It measured 5-7 metres in length and weighed about 1 tonne. Utahraptors lived in what is now Utah, USA, in the Early Cretaceous Period (about 120 million years ago).
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