They fluttered all over, in and around the Smoky Mountains, wings beating so fast it was difficult to really see their markings. Darting from flower to flower then stopping for a mineral fuel-up from puddles on the swimming pool’s concrete, I marveled at the flamboyance of the pipevine swallowtails. Those brilliant spots are a warning. Early life as caterpillars feeding on pipe vines makes them unappetizing or even toxic to predators. So they go about their business and, once in a while open their wings to reveal a swath of gorgeous iridescent blue. Then they are off to sample the next flower.