flutter by

I shot this little beauty on the banks of the Little Buffalo River in a city park in Jasper, Ark. He and a bunch more butterflies were slurping the water from the wet sand. I wish I'd had my poor-man's macro set-up with me. Does anyone know the species?

 

UPDATE: tater48gem, who has an impressive collection of butterfly photos in his stream, says this is an eastern swallowtail.

 

Done