CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
Iguanodon dinosaurs. Computer artwork of a group of Iguanodon dinosaurs drinking at a watering hole. Iguanodon was a herbivorous dinosaur that lived throughout much of the world during the early (lower) Cretaceous period, from around 140 to 100 million years ago. Discoveries of large numbers of Iguanodon fossils together imply that the animal lived in herds.
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