|Photo by Marty Horowitz 10/11/12|
Marty assures me that this photo is unaltered. What a sight! Marty writes:
[T]hese are Giant Swallowtails, which have a single tail on each hind wing. However the first and second butterflies are each missing one of their tails, likely due to attacks by birds, demonstrating how their design lets them sacrifice a non-essential piece of themselves in order to survive, not unlike a lizard tail (but butterfly "tails" don't regenerate).