Brian Brown can discover a new kind of fly anywhere. He often takes up the search in exotic locales such as New Zealand, Chile or Taiwan, but he’s not picky. Once, he was challenged to find a new species in a Los Angeles backyard. After setting a trap and waiting, he pulled out a winner: “Turns out it was a new species, the first thing I pulled out of there,” he says. And it wasn’t a fluke. The second fly was a member of a species previously known only in Europe.