The Anise Swallowtail is a common swallowtail butterfly of western North America. Both the upper and lower sides of its wings are black, but the upper wing has a broad yellow stripe across it, which gives the butterfly an overall yellow appearance. There are striking blue spots on the rear edge of the rear wing, and the characteristic tails of the swallowtails. Its wingspan is 7–9 cm.
Fun Fact The first three larval instars resemble bird droppings, coloured black with a white saddle, and later instars are green with black bands and yellow to orange spots.