| http://www.w3.org/ns/prov#value | - Massive: Sauropods, like this one pictured in an artist's impression, were the giants of the dinosaur era, often growing to lengths of over 100 feetThese air sacs, similar to ones found in the physiology of modern birds, also extended into their vertebrae and other bones, making the vast dinosaurs much lighter than mammals of equivalent size would be (if any such existed).Switek references a paper
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