Deinonychus lived during the Cretaceous period, about 110 to 100 million years ago.  Deinonychus may have hunted in packs, attacking even very large animals, perhaps even large sauropods and ankylosaurids. This 3" specimen is a Dinosaur Replica or Dinosaur Reproduction. One of earth science resources. Among the best fossils for kids. Makes for a great dinosaur gift.