Utahraptor

Utahraptor (Utah Thief) is the biggest dromeosaur. It first set foot on earth 126 million years ago, in the Early Cretaceous period. Utahraptor can stretch up to 7 meters (22.9 feet) long and about 4 meters (13.1 feet) high. It has no evidence of feathers; however scientists speculate that it does have feathers since alot of other dromeosaurs have feathers.

Its most amazing feature is the cycle-shaped claw on the inner toe. It could go a full 180 degrees round extremely quick. This theropod is said to be really quick, able to reach 64 km (39.8 miles) per hour. It was very agile, turning 90 degrees in less than 1 second.

These huge Dromeosaurs hunted in packs, co-operating to take down its prey. It used its huge inner claw to suffocate the victim, something like Velociraptor. The arms were probably used to grab on to prey while they were trying to make the kill. The head was used as another 'suffocating weapon', disabling the animal from breathing and letting it die off as a result. They also obviously could claw at their prey with their claws (as seen in picture to the left).

More real-life information: Utahraptor at Wikipedia.

Jurassic Park Series
Utahraptor doesn't appear and isn't mentioned in the novels and movies. It does appear in the Jurassic Park merchandise.

But still, it seems that Utahraptor played an important of the Jurassic Park movies. The Velociraptors featured were much larger than any raptor described at the time of production of the first movie. Utahraptor was found, in fact, just before the movie entered theaters, thus explaining the size of the giant raptors that have now become classic movie monsters.

Jurassic Park inspired games
Utahraptor can be created from paleo-DNA in the game Jurassic Park III: Park Builder.

Toy lines
Utahraptor has been featured in the Jurassic Park dino toys series. It resembles a velociraptor though it's a bit darker.