Utahraptor was a large dromaeosaurid from early cretaceous Utah. Utahraptor was the largest raptor in the world. Utahraptor was discovered in 1993 by James Kirkland. Utahraptor was likely an ambush predator instead of being a pursuit predator like other dromaeosaurids. Utahraptor was in the subfamily Dromaeosaurinae, meaning it was closely related to other large dromaeosaurids like Dakotaraptor and Achillobator.