Dinosaurs lived for over 160 million years, first appearing about 230 million years ago. To many children, dinosaurs are very big.
Since the first dinosaur was found in the 19th century, dinosaurs have become major attractions at museums around the world. And now dinosaurs have become a part of world culture and remains popular, especially among children. They have been told in books and films such as Jurassic Park, and new discoveries are often covered by the media.