Dryptosaurus was a primitive tyrannosaur. Adults measured about 20-26 feet long and weighed over 1-2 tons. Dryptosaurus had very long arms and claws for a tyrannosaur. The talons on the hands were over 8 inches long! This kind of trait is somewhat common in early members of the group. Dryptosaurus would have been a top predator. This dinosaur lived in North America roughly 70-75 million years ago.