Utahraptor ostrommaysi was one of the largest species of dromaeosaurids (more commonly known as raptors) ever found. It lived in the Early Cretacous, roughly 139 to 134.5 million years ago.
This relative of Deinonychus and Velociraptor is estimated to have topped out at about 20 feet in length and around 770 pounds in weight, giving it roughly equivalent dimensions to those of a Polar Bear.
Like all members of its group, it sported a wicked sickle-like claw on the second toe, which measured almost 10 inches long.
There is evidence of group socialization, likely in family units or packs, though it is unclear if they hunted together or merely participated in group feedings on larger prey items.
I love how the duality of non-avian dinosaur names is like
"This one is called velociraptor, meaning swift robber, because of its adaptations for running. This one is called utahraptor because you'll never guess where we found it."