N atan Bainosowitz a district inspector for Israel’s Nature and Parks Authority was on patrol in the Arab-populated Wadi Ara region when he heard the clear and constant chirping of goldfinches those highly popular but endangered birds known for their special song. He followed the sound thinking that he’d find a cache of netted birds trapped by a local black-market bird trader. But when he reached the source of the chirping he found not some coveted songbirds but rather a small digital recorder. It was emitting a constant chirp in order to attract live goldfinches.