The sheer gargantuan size of Godzilla makes his existence anatomically impossible. At least, that is what Popular Mechanics magazine has concluded.
Godzilla weighs over 150,000 tons, as much as a cruise ship, and is over 200 feet tall. The authors claim such massive weight and bulk would cause enough pressure for an animal of that size to overheat, its organs to implode and it need to "mainline butter to get enough calories."
Paleontologists consulted about Godzilla's 2014 cinematic anatomy concluded that his 1640,000 estimated pounds of girth would easily pass the allowable theoretical archeological liveable limit of 110-1100 tons for land animals. The biggest dinosaur specimen, the 100-ton Argentinosaurus, stood 70 feet tall, was 115 feet long, and had four limbs to distribute its enormous heft.
His energy output would be enormous, generating 1.4 megawatts of power at rest (as much as a wind turbine) and 37 megawatts in full rampage (enough to fuel a hamlet of 3000 Japanese citizens).
The force of pressure on Godzilla's bones would be equal to 300,000 megapascals, the same pressure found in earth's lithosphere, located 60 miles underneath the blue marble's surface. That's twice as tough as Titanium, 12 times more than a human and 20 times more than a T-Rex.
The osteoderms, or the bony deposits that make up [Godzilla](movie:45291)'s "chain mail" would make him incredibly tough but also very hot. If he didn't have venting spikes on his tail he would pass-out every few miles or so.