I had the pleasure at my job the other day, I work as am Horticuluralist at a botanical garden in South Florida, to have this beauty chill out with me for a moment. This is a Papilio cresphontes or Giant Swallowtail. This guy is one of my favorites. This butterfly is one of the largest butterflies in the United States.
These caterpillars have this forked organ, called an osmeterium, that emits a noxious odor. These ‘stink glands’ are used to help repel potential predators such as ants that may try to attack them. They love to snack on citrus tree leaves, wild lime and torchwood.