Not a Swallowtail, but a Great Mimic!

I found this Red-Spotted Purple Butterfly (Limenitis arthemis astyanax) on the edge of a large tract of woods of Mulberry Road, near Lanier Road. It was perched low on the branches, in the shade on a hot afternoon. It didn't seem concerned with me walking up on it and moving the branches to get a clear shot with my camera. It lingered while I got my pictures and never did fly off!

From what I read online, the caterpillar looks like bird poop, and the adult coloring mimics the poisonous Pipevine Swallowtail (Battus philenor). Common throughout much of the eastern United States, it prefers to eat rotten food and to drink from mud puddles.