"Pupating" Eastern Black Swallowtail
In my driveway, I later saw a Eastern Black Swallowtail who had recently emerged from the cocoon! I spotted the empty cocoon on the side of the garage. (By the way, these cocoons don't look anything like mystery cocoons I've spotted on my rose bushes ,which are probably bagworm.)
Another swallowtail cocoon- by Lenses
The butterfly was still wet-winged and struggling, so I moved it to a sunnier, safer spot. I hope it survived to flutter around like this Eastern Black Swallowtail I photographed last summer.
You may also be interested in my previous posts on butterflies and butterfly gardening: