@SerpenIllus @jadeinottawa this topic always fascinated me, as there is a clear convergent evolution of structures that anyway differ a lot. However, I should point out that Ouranosaurus shows a different sail shape ;) have a look here :D
https://t.co/7j3CFW9qMv
Don't miss this detailed analysis of the Venice specimen of Ouranosaurus nigeriensis - aided by a 1970s field map https://t.co/ar5KAivtcD https://t.co/gNQw66u6dC