I am still trying to figure out how the blood circulated if this thing raised its head to the full extent.
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And while you are at it, figure out how an animal that large and massive could even exist if gravity is constant ... the size and mass of land animals is a funtion of gravity strength. No such massive land animal could exist today - it would be crushed by its own weight.
Some of the pterosaurs absolutely dwarf the largest flying birds of today. How could they have ever flown, if conditions were the same then as today?