dinosaurs lived in herds dinosaurs lived in herds reported footprint being formed footprint being formed reported Live Science Huge trove of dinosaur tracks found in Alaska LiveScience LiveScience.com Huge Trove of Dinosaur Footprints Discovered in Alaska Duck-billed dinosaurs left thousands of tracks in Alaska dinosaurs lived in herds Live Science This story footprint being formed Live Science ‘World-Class’ Dinosaur Track Site Discovered in Alaska