View Comments Warren Bielenberg spends a lot of time photographing Southern Appalachian butterflies in Great Smoky Mountains National Park. But he willingly admits that his journey of butterfly discovery didn’t begin in earnest until he retired from 34 years as a park ranger and began volunteering in the park’s popular Cades Cove. “One day there was a family of three with a little girl, maybe 11 or 12 years old, near a group of blue butterflies along the road,” said Bielenberg. “I went over and said they looked like pipevine swallowtails. But then the little girl immediately corrected me and said, ‘No, those are spicebush swallowtails!’ I’d never heard of them, but she pointed out a very subtle difference between the two.”