Richard Dawkins, in either ‘The Selfish Gene’ or ‘The Blind Watchmaker’, describes the arms race between bats and insects. Quite a fascinating affair—just bats' own evolution is intriguing: how do they differentiate between their own and others' echolocation signals? Well they have a ‘code’ in the signal specific to each specimen. And then, insects ‘learn’ to mimic bats' signals so a bat thinks it's another bat there and not a dinner. Etc etc.<p>This discovery might be at least the third one this year in this same field, if another one mentioned in the article isn't the one I've seen on HN.