In this hothouse world with abundant vegetation perhaps many long-necked sauropods might have grown more rapidly, breeding at a younger age and shrinking in size; several ‘dwarf’ sauropods (some little bigger than a cow) were already known from European islands in the late Cretaceous. The largest titanosaurs of mid-Cretaceous South America – 40m-long (131ft) creatures heavier than two jet aircraft – were already long gone.

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