But bar-coding is fast and cheap because it uses just one piece of one gene—and that makes it prone to errors. In 2008, Pyle made a definitive distinction between two new fish species, even though their bar codes were essentially identical. "It's a blunt instrument," Wheeler says of the DNA system. "One gene just isn't sufficient." Looking at actual specimens is an art, he says. Plus, it's fun. Although he admits that someday it might be possible to define new species using only DNA, he doesn't like that idea much: "That would make taxonomy too boring to be worth doing."