Again, what are you basing this on?

I would hazard a guess that you have never seen a wild Boid? What about a wild Boa constrictor? If the answer to any of those two questions is yes I think your previous response would have been very different.

Whilst the traditional answer might well have been "no, boas don't need UV" I think many people who have used UV on their snakes / given their animals to unfiltered sunshine would argue differently.

I currently have a research project running studying this very subject. Initial findings made by an MSc student (on behaviour) are incredibly interesting. Long term studies on blood D3 levels will enlighten us even more.

For the time being, let's just say that we just don't know enough to make definitive statements like yours. Whilst an animal may grow and breed without UV, this doesn't mean to say that given access to such wavelengths that that particular animal wouldn't live longer, breed better, have higher fecundity etc etc.
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