In Godzilla, King of Monsters, at the end of the movie when Godzilla gets his Thermonuclear form, and uses the Thermonuclear blast, he is seen to get wings.

[![enter image description here](https://i.stack.imgur.com/PUPrG.jpg)](https://i.stack.imgur.com/PUPrG.jpg)

This has also been added to a model of him:

[![enter image description here](https://i.stack.imgur.com/17A0g.jpg)](https://i.stack.imgur.com/17A0g.jpg)

Why did this happen? And is this something to do with the emission of the Thermonuclear energy, or some new ability (like flight)?