Giant Swallowtail Papilio cresphontes

It is indeed big. Though not much larger than the black form of the female Tiger. This upper wing pattern in the east is definitive. Nothing else like it. In Texas beware of some encroaching Mexican species. A fast flying butterfly, often cruises up high and nectars on vine flowers and upper story blooms. This one was not flapping and was open. A rare event for a puddling Giant.    

Female egglaying in Florida.

Early instar of the caterpillar which is a bird poop mimic.