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Interesting idea proposed by Dex:
The rainbow rod/serpent's wings are transparent, like a sun catcher/stained glass/insect's wings. So they case a rainbow down below wherever they are flying (as long as it's day, of course).
>When groups of them gather and migrate, they cover the ground with the colours. Like a rainbow borealis. In the middle of the day.
I think it paints a pretty picture, and can be used for dex material. And gives us something else to do with the design. If we want to stray from a Quetz, we could always do more insect-like wings to refer to rods.