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Heraclides cresphontes
Photo take at my backyard this is the second time i can photograph this one never stay still, I´m not sure but i think is a : Giant Swallowtail / Papilio cresphontes Cramer
There is a page that describes concisely the markers between the two species in Bugguide.net; http://bugguide.net/node/view/157023
I use it to refresh my memory of the details to observe.
Thanks Bayucca i have the same dilemma i going to add another photo is no very good but maybe helps
Could be, but could also be Heraclides thoas. You can't really see the important markings. I would slightly tend to Heraclides cresphontes as well, but I would not confirm it 100% from these pictures.