Source: Pohl, GR, Patterson, B, and Pelham JP. 2016 [unpublished]. Annotated taxonomic checklist of the Lepidoptera of North America, North of Mexico. EXCEL version 1.1. (15 June 2016)
The Giant Swallowtail is a swallowtail butterfly common in various parts of North America and marginally into South America (Colombia and Venezuela only). In the United States and Canada it is mainly found in the south and east. With a wingspan of about 10–16 cm (3.9–6.3 in), it is the largest butterfly in Canada and the United States.
An adult's wingspan is about 100–160 mm (3.9–6.3 in). The body and wings are dark brown to black with yellow bands. There is a yellow "eye" in each wing tail. The abdomen has bands of yellow along with the previously mentioned brown. Adults are quite similar to the adults of another Papilio species, P. thoas.
The mature caterpillar resembles bird droppings to deter predators, and if that doesn't work they use their red osmeterium. These are 'horns' which they can display and then retract. The coloration is dingy brown and or olive with white patches and small patches of purple. Citrus fruit farmers often call the caterpillars orange dogs or orange puppies because of the devastation they can cause to their crops.