This great reference title for children features free 3D glasses that bring the images in this title to life. Take a journey back in time and meet some super-sized dinosaurs. Skip forward a few millennia to the Ice Age and get close to hairy mammoths and early humans. Then time travel right up to the present and take on some of Earth's fiercest predators, beastliest bugs, and deadliest spiders. Get ready for an incredible 3D encounter with the world's most amazing creatures.