In a comprehensive guide, Butterflies of Pennsylvania: a field guide by James L. Monroe and David M. Wright, the butterflies that traverse the state are described in stunning detail, with over 900 color photos to complement them.  Here is a selection of ten out of the one hundred and eighty-six species that make up Pennsylvania’s unique butterfly population. Zebra Swallowtail So aptly named for the mammal that it resembles, male Zebra Swallowtails puddle, or rest in sandy or gravely areas to absorb salts and amino acids, which aid in their reproduction. Diana Fritillary The Diana Fritillary is incredibly rare, and…