Fossils provide link in dino crest evolution
Skeletal remains show how duck-billed dinosaurs evolved
![skulls](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/01/012316_notebook_introducing.jpg?fit=860%2C460&ssl=1)
SUPERDUCK Estimates based on its skull (left) and skeleton put P. bergei at about 9 meters long. Its descendants, B. canadensis (right), didn’t have much bigger skulls, but their crests grew larger.
E.F. Fowler