Killer butterfly

I spent Saturday out photographing birds with greasy suggestion and a visiting birder from South Africa. Aside from the pleasure of finally meeting one of my Flickr friends in person, it was a terrific day and we had a nice set of representative local birds, but one of the more interesting things we saw was this Eastern Towhee being driven off by a Pipevine Swallowtail. I've never seen a butterfly acting territorially before, but he definitely did not want the towhee there... Weldon Spring Conservation Area

Done