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It is certainly possible. In fact, we do know of a very large dromaeosaur that lived in the Late Cretaceous, Achillobator (6 meters in length). It lived 90 million years ago, much later than Utahraptor lived (which was about 125 million years ago). Austroraptor lived later still, about 70 million years ago, and measured 5 meters in length. Styracosaurus Rider (Speak to the Rider, your Lord and Master) {Look upon my servants} 15:30, November 14, 2011 (UTC)