I found this guy last July 2015, sunning himself on the path in Dunn Woods. I am not well versed in the world of insects, but I am pretty sure this is a Red-spotted purple, aka Limenitis arthemis. Funny name, as the butterfly is obviously blue, not purple. On the static image below, you can see the red spots on the upper part of the wings. The red-spotted purple is a mimic of the poisonous Pipevine Swallowtail, which would seem to be its main defense. It is a member of the largest group of butterflies, Nymphalidae, which are commonly called four footed, butterflies as they stand on only 4 of their 6 legs, the two front one are usually curled up. They are also known as brush-footed butterflies, as the two front feet are often quite hairy. Other members of the Nymphalidae include emperors, monarchs, admirals, tortoiseshells, and fritillaries. It took me a good hour to figure this one out, if you have a favorite site or book for IDing butterflies, let me know!