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Then there is the issue of neck size - a long necked animal of that size would not even be able to lift its neck.

Secret Air Sacs Made This Dinosaur Extra Light

Brian Switek
May 22, 2017

The largest dinosaurs to have ever lived were surprisingly light.

I know that might sound strange when we’re talking about animals stretching over 100 feet long and weighing upwards of 45 tons, but it’s true.

Immense, long-necked dinosaurs like Supersaurus had extraordinarily light bones assisted by a complex system of air sacs that so pervaded their skeletons that you can see exactly where they would have been even though the actual soft tissues decayed away millions and millions of years ago.

This was true for comparatively smaller species, too. Even an “average” sauropod was far larger than an African elephant or Paraceratherium, the largest land mammal of all time. Sauropods were enormous by comparison, and air sacs assisted them at all scales.

Not all sauropod had the same complement of air sacs, though. The anatomy and extent of those structures varied from species to species. And, as paleontologist Luci Ibiricu and colleagues report, a South American sauropod named Katepensaurus goicoecheai had a pneumatic variation never seen before.

If you haven’t heard of Katepensaurus before, that’s probably because it was part of a relatively obscure group of sauropods called rebbachisaurids that lived in South America, Africa, and Europe. They were cousins of Diplodocus that were stomping around during the Cretaceous, after the heyday of North American diplodocids was long over. But apparently some of these dinosaurs took pneumatic skeletons to a degree not seen before in other dinosaurs. ...”