Board Thread:General Discussions/@comment-24981691-20140525033847/@comment-7622429-20140728101232

I have my own theory on this matter. I theorize that Godzilla, the MUTOs, and other daikaiju evolved divergently from specific animal lines, with each unique form diverging at a certain point from the main evolutionary timeline. For example, the MUTOs and Godzilla are likely some of the oldest, well over 250 million years old, since they have some of the most uniquely primitive set of features, the MUTOs likely evolving from an arthropod evolutionary chain, but eventually gaining a sort of "pseudo-skeleton" out of it, and Godzilla evolving from early amphibians, evolving lungs but never actually losing the gills.

Both evolved from specific subsets of animal evolution, but would eventually become unique forms of life due to the radiation. Another example would be the recently confirmed Rodan. Now, he/she could've come from nearly any timeline, but if we assume a similar period as Godzilla and the MUTOs, then we can theorize he/she came from a much more different lifeform, evolving on its own due to the radiation into a unique form of life.