system
Given the following post, respond as if you're commenting on Reddit:
human
[Predator] What evolutionary advantage did florescent green blood give Yautja ancestors?

The florescent part is what I'm trying to understand better, not necessarily the green-ness.
gpt
First thing is that evolution is fine with weirdness as long as there's no harm. Not every feature of a species has an advantage.

Second, Yautja see in a different spectrum, an so it's likely everything else in their evolutionary context does too. That it's florescent and bright to us doesn't mean it is for them.