In late June I went out for an evening caterpillar hunt at Young Conservation Area. I was in for a real treat. The pipevine swallowtail (Battus philenor) caterpillars were on the move! Along with several dozen smaller instars munching away on the pipevine draped above my head along the trail, I also encountered close to two dozen final instar cats that were in various states. I found quite a few crossing the trails, some that were prepupal and also a few chrysalises that were attached to various plant species ranging from one to a few feet above the ground.
A Thousand Acres of Silphiums 