AFAIK someone calculated a theoretical
limit for quadrupedal land animals at 140 t because then the legs have to be so
thick that they touch. BTW, I don't believe the 100-t-estimate for
Argentinosaurus -- Brachiosaurus has been credited with
serious estimates between 15 and 75 t, for example; I prefer the former
estimate, because most titanosauriforms had more air than bone in their
vertebrae and must have had large air sacs.
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