Those pretty green tails fluttering and whirling at the end of a luna moth's hind wings turn out to be pretty good defensive weapons in an acoustic war with predatory bats.
As tips of a moth's tails whirl in two circles behind the wings, they reflect the echolocation pings that a bat uses to find and nab prey out of the air. That can trick bats into attacking a more expendable body part, or missing the luna moth altogether.
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