An exciting discovery!

I recently discovered this butterfly on a late morning hike.  I find that the time of the hike somewhat determines which insects are active.  It was a new one for my photographic collection.  It turned out to be the Black Swallowtail Butterfly.  I found it difficult to photograph because I could not seem to catch a specular highlight in the eye upon which to focus.  I later decided that I should have looked at the base of the antenna when focusing.  The plant upon which it is sipping nectar is the Teasel.