Utahraptor is a large carnivore that lived in North America during the early Cretaceous period, between about 132 and 119 million years ago. It is around 7 meters long and around 1.8 meters tall and weighed about 1,110 lb, it currently the largest of the Dromaeosauridae and would be dangerous alone but deadly in a pack.Using their large size and intelligence they would work together and kill far more deadly opponents that they could never kill on their own. 

The classification is based on:

Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Family: Dromaeosauridae
Subfamily: Dromaeosaurinae
Genus: Utahraptor