Mamenchisaurus

A plant-eater, Mamenchisaurus had the longest neck of any dinosaur. Despite its size, the neck was lightweight because it was built from hollow vertebrae which, in places, were eggshell thin. These were important weight-saving features. The 19 bones that made up this sauropod's neck were linked by bony struts, making it stiff and not very flexible.

Xiliao

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