Utahraptor ("Utah thief") is a genus of theropod dinosaurs, including the largest known members of the family Dromaeosauridae. Fossil specimens date to the upper Barremian stage of the early Cretaceous period. Utahraptor was arguably the most terrifying creature on planet Earth.
Utahraptor appears in the episodes "Biggest Killers" and "Raptor's Last Stand".[124-100]
Standing 2.4 meters tall, a little bit taller than a modern human, measuring 23 feet long and weighing in at 1,100 pounds, the Utahraptor was the largest known Dromeosaurids (popularly known as raptor dinosaurs). Its powerful forelimbs ended in three curved, blade-like claws, and it walked on two short, sturdy legs with sharp, sickle-like claws at their ends.
Like other dromoaesaurids, Utahraptor may have hunted in packs, which made it an even more fearsome predator. Fast-moving and agile, with excellent vision, the Utahraptor was nonetheless slower than smaller relatives such as Deinonychus or Velociraptor; it would probably have lain in wait, then pounced on the back of its victim, slashing and tearing apart its flesh with its sharp claws.
Utahraptor's prey possibly included very large herbivorous dinosaurs such as sauropods. When food was scarce, it would even take on the heavily armored ankylosaur Gastonia.
- When it ran, the Utahraptor rotated its middle toe (the one outfitted with its lethal claw) upwards and ran on the other three toes.
- The utahraptor has only quill knobs on the head and arms although they had feathers all over their bodies excepted their mouth and feet