Deinonychus, the "Terrible Claw," is a famous dinosaur that was at the forefront of paleontologist John Ostrom's "dinosaur renaissance." Ostrom lead the charge in reforming dinosaurs from slow, cold-blooded lizards to the swift, warm-blooded birds we know today, effectively revolutionizing dinosaur knowledge. With a maximum length of three meters and height of about a meter, Deinonychus was a strong creature with a powerful body ready to attack. Like its fellow dromaeosaurids, it possessed a sickle-shaped claw on its second toe and likely had feathers covering its entire body. Living during the early Cretaceous Period, Deinonychus made its home in North America's tropical climates. Deinonychus' limbs could grasp and clutch objects well. They may have allowed for tree climbing, leading to possible arboreal behavior. The Deinonychus hunted small- and medium-sized dinosaurs with a technique called "raptor prey restraint," in which it attacked prey, held it down, and ate it alive. Although many people believe they hunted in packs to tackle large prey like Tenontosaurus, a different hypothesis states that Deinonychus may have "mobbed" prey, similar to how Komodo dragons hunt alone but gather in groups to feast on recent kills.