What is it good for? Absolutely one thing. Luna moths use their tails solely for bat evasion – Research News https://www.floridamuseum.ufl.edu/science/what-is-it-good-for-absolutely-one-thing-luna-moths-use-their-tails-solely-for-bat-evasion/
In a pair of complementary studies, researchers take a close look at Luna moth (Actias luna) tails through the eyes of birds and female moths to test their role in predation and sexual selection. Scientists have known for about a decade that Luna moths — and other related silkmoths — use their long,
The long, trailing tails of Luna moths function as an evolutionary slight of hand