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Horwood Beer-Master
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by Horwood Beer-Master » Mon Jan 23, 2012 1:08 am
...tion?
Darren Naish wrote:Why were elaborate cranial ornaments so diverse and so widespread in pterosaurs and Mesozoic dinosaurs? These structures – grouped together here as ‘cranial crests’ – vary markedly in form and position: they range from the semi-circular blades and keels present at the snout-tips of ornithocheiroid pterosaurs to the hollow tubes, fans and plate-like crests of lambeosaurine hadrosaurs and the bony frills of ceratopsians. Horns, hornlets, bosses, twin ridges and other structures decorate the skulls of various ornithischians and Mesozoic theropods, various pterosaurs possess sail-like crests, there are the thick skull domes of pachycephalosaurs, and so on. We can say with confidence that cranial ornamentation was common, if not ubiquitous, across Ornithodira (the clade of archosaurian reptiles that includes dinosaurs and pterosaurs)...
Looooong article.
Go read. 
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Pappa
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by Pappa » Mon Jan 23, 2012 11:50 pm
They're not dinosaurs, they're proto-birds!
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Gawdzilla Sama
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by Gawdzilla Sama » Mon Jan 23, 2012 11:55 pm
Pappa wrote:They're not dinosaurs, they're proto-birds!
That's why they say dinos soar!
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