Deinonychus

Deinonychus (meaning "terrible claw") is an extinct genus of dromaeosaurid theropod dinosaur. It measured about 2.9 feet high at the hip, and about 11 feet long. Its weight is estimated at 161 lbs. Bones of several individuals of Deinonychus have been found with the skeleton of a large ornithopod, called Tenontosaurus. This has been historically interpreted as evidence of pack hunting, though most experts nowadays think it was a scavenger congregation.

In addition; recent studies have been bolstered their solitary lifestyle. At any rate, modern pack hunting animals can't bring down prey that is too large, and Tenontosaurus was roughly as big as a rhinoceros, compared to the dog-sized Deinonychus. Despite the study, many paleontologists still believe that Deinonychus still hunts in packs.

Deinonychus was highly specialized for swift movement and savage attack. With its terrible claw flicked forward it slashed its prey with one foot while standing on the other. This kind of behavior required good coordination, excellent eyesight and a high level of energy.