In Sumacó, Ecuador, Entomologists Jesse Barber and Akito Kawahara study the centuries-long evolutionary arms race between moths and bats. Moths have had to develop a wide range of bizarre and clever defenses to combat the threat of bats, from emitting toxic smells to jamming bats’ echolocation sonar with their thorax, Kawahara and Barber describe this fascinating battle in the night sky.