File:Pachycephalosaurus ontogeny skulls - Museum of the Rockies - 2013-07-08.jpg

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English: Three Pachycephalosaurus skulls, showing the development from juvenile to adult, at the Museum of the Rockies in Bozeman, Montana. In the lower right is the mis-named Dracorex -- once thought to be a genus of the Pachycephalosaurs but now understood to be the juvenile form. Although the skull protrusions are spikes rather than knobs, and the smooth dome over the skull unformed, all protrusions are in EXACTLY the same location as they are in the adult Pachycephalosaurus -- proving this is a juvenile form. (It is unclear is this is a fossil or cast, or where it is from.)

At the bottom center is the mis-named Stygimoloch. Once considered to be a genus of Pachycephalosaur, it is now recognized to be a subadult. (It is unclear is this is a fossil or cast, or where it is from.)

At the upper left is the adult Pachycephalosaurus, discovered in Carter County, Montana.
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Source https://www.flickr.com/photos/23165290@N00/9329893746/
Author Tim Evanson

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This image was originally posted to Flickr by Tim Evanson at https://www.flickr.com/photos/23165290@N00/9329893746. It was reviewed on 6 August 2013 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-sa-2.0.

6 August 2013

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current19:03, 6 August 2013Thumbnail for version as of 19:03, 6 August 20133,000 × 2,644 (5.11 MB)Tim1965{{Information |Description ={{en|1=Three Pacycephalosaurus skulls, showing the development from juvenile to adult, at the Museum of the Rockies in Bozeman, Montana. In the lower right is the mis-named Dracorex -- once thought to be a genus of the P...
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