Swallow-ed tail?

Walking back and forth through the backyard yesterday, I spotted a yellow butterfly snacking on some lantana.   I went in the house and got my camera to try to get a shot or two.  This is the clearest one.   I believe it is a kind of  swallowtail butterfly.   But it appears that something has nipped the tail end of his wings.   I’m sure he has some stories to tell…

OLYMPUS DIGITAL CAMERA