Long before people lived on earth, dinosaurs roamed the land, flew in the air, and swam in the sea. Meet some of these fantastic prehistoric creatures, learn all about them, and build five cool models: Piplodocus, a herbivore with the longest tail of any animal ever; the Albertosaurus, a carnivore; the water-dwelling Plachochelys; the winged Pteranodon; and a dinosaur skeleton.