The Godzillasaurus is different from other theropods because its posture is more upright like a human, and it drags its tail on the ground, much like older theropod reconstructions. At 12 meters in height, it is much larger than any other theropod species, probably due to its erect posture. It has a smaller head than a real theropod, and has a double-row of teeth, much like a shark. The Godzillasaurus species is also different from other theropod dinosaurs due to the fact that it contains a second, or "sacral", brain located in its hip to control lower body functions, like how the Stegosaurus might have had a second brain.
As is shown in Godzilla vs. MechaGodzilla 2, Godzillasauruses seem to be telepathic, as Baby Godzilla can contact his father. However, it is unknown if an unmutated Godzillasaurus would have this ability.
The Godzillasaurus lived out in Lagos Island in Godzilla vs. King Ghidorah, and was attacked by soldiers during World War II. This was observed by Futurians that had traveled back in time to remove Godzilla from history. They transported the wounded Godzillasaurus to the Bering Sea, thinking it would die. However, the Godzillasaurus was mutated by a nuclear submarine crash without them knowing.
Another Godzillasaurus, Baby Godzilla, is found in Rodan's nest in Godzilla vs. MechaGodzilla 2. This one seems to have been affected by nuclear radiation as well, considering the fact that when he was Little Godzilla in Godzilla vs. SpaceGodzilla, he was bigger than the seemingly adult Godzillasaurus.
The back side of the box of Jakks Pacific's Giant Godzilla figure states Godzilla was an amphibious reptile evolved while Earth had ten times more radiation. In Godzilla: Awakening, it's revealed that the species originated in the Permian Age and survived the countless mass extinctions afterwards.
Despite its relatively small size, the Godzillasaurus that would eventually become Godzilla displayed a high amount of strength and endurance. Small arm's fire and even rocket launchers were unable to damage him, and only barrages from several battleships were the only things strong enough to draw blood and weaken it.
In Godzilla: Awakening, it possessed Atomic Breath even back before it was hit by the Hydrogen Bomb.
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