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. 2011 Sep 28;6(9):e25186. doi: 10.1371/journal.pone.0025186

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Campione, Evans.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Hypothesized growth series for the two recognized Edmontosaurus species. (A) Specimens from left to right: CMN 8399 (holotype of T. edmontoni), USNM 12711, ROM 801. (B) Specimens from left to right CMN 8509 (holotype of E. saskatchewanensis), ROM 57100, MOR 003. Scale bar, 20 cm.