STEPHEN J. KRASEMANN / SCIENCE PHOTO LIBRARY STEPHEN J. KRASEMANN / SCIENCE PHOTO LIBRARY
Skeleton of a Pachyrhinosaurus dinosaur. Pachyrhinosaurus (meaning thick-nosed reptile) is a genus of ceratopsid dinosaur from the Late Cretaceous period of North America. Instead of horns, the skull bears massive, flattened bosses, the largest being over the nose. These were probably used in butting and shoving matches, like musk oxen. A single pair of horns grew from the frill and extended upwards. It appears that both the shape and size of the frill was highly individualized. Pachyrhinosaurus was 5.5 to 7 meters long. It weighed about four tonnes. It was herbivorous and possessed strong cheek teeth to help it chew tough, fibrous plants. Grande Prairie, Alberta, Canada.
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