Just as the energy of the plants and animals in the biosphere comes directly or indirectly from the sun, most of the superbeasts in this book also derive their energy directly or indirectly from nuclear energy (the rest of the energy is a matter for later).

The superbeasts in this book are set up as [Direct Core Eater], [Indirect Core Eater] and [Others].

The Sakingsaurus that has already appeared is a direct nucleo-eating superbeast, which cannot absorb nuclear energy from living organisms, and can only absorb natural radioactive energy, or nuclear energy from minerals. It's like a plant-eating animal.

And Godzilla can eat both directly and indirectly and is considered an omnivore, just like us humans.