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Dinosaur weights; overestimated?

 You know one thing that REALLY peeves me in the field of dinosaur 
research is the overestimation of a dinosaur's weight. The formula used 
to estimate weights in animals basically works for dead weight animals ( 
mammals for example.) Dinosaurs were probably like birds in that they 
had extensive air-sacs through their bodies; mammals lack that feature 
and are mostly liquid, muscle, and bone. So a mammal and a bird that are 
the same size and have the same measurements will differ in weight since 
birds are mostly air. The same is true for all dinosaurs. They all have 
hollow bones and air-sacs like birds so they were light like birds. This 
information is never given or really considered in weight estimations. 
This is why the weight of Tyrannosaurus has been overestimated 
frequently. It should weigh about 3-5 tons and possibly less. Sauropod 
weights have been overestimated since the presense of big air filled 
necks is never taken into consideration. 
 I wish feedback: do any of you concur?

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