new Godzilla 2014-biomechanical problems?

[Hammer <hammeris1@att.net>]

There is supposedly 2 other "monsters" in the film - are we finally going to 
get our radioactive mutant carnivorous sauropod?  :-)
Will there be an up-to-date "Rodan" pterosaur with a penchant for cetaceans on 
its menu?

As experts, what physical problems would you see for a beastie this large being 
able to support its own weight, etc.? (I won't press you on the radioactive 
"fire" breath)  :-)