Each Jurassic World Mighty Little Biters collectible dinosaur evolves from cute to angry with one easy motion. Push down on the head to open the mouth and see the top teeth extend out aggressively while the eyes change from a cute, normal look to a fierce attacking look. Fidgeters will have great fun changing back and forth. Each toy is about 3 inches long and 3 inches tall and popular species are included like T. rex, Velociraptor and Ankylosaurus. Even the packaging has "bite" marks. Each Mighty Little Biter sold separately, subject to availability. For dinosaur fans ages 4 years and up, especially Jurassic World fans. Colors and decorations may vary.