Dig deep with Explorer: DINOSAURS to uncover the fascinating world of of these ancient creatures. Our six-foot-long fold-out timeline features over 100 of the most incredible dinosaurs that ever lived--from their first appearance about 230 million years ago through to their living descendants, the birds, today. Join our eagle-eyed explorer on his quest to find out as much as possible about these amazing creatures in his fascinating journal. Find out why the dinosaurs were so successful, who discovered the first one, what killed off the land-based dinosaurs 65 million years ago and where you can find the best dinosaur remains today