The Zebra Swallowtail has triangle-shaped wings. It has long tails on the hind wings (the bottom wings). It has some black and white markings on its wings. There are some small red and blue markings on the hind wings. There are two seasonal forms. Spring forms are more white. They have small black tails with white tips. Summer forms are more black. They have longer tails with more white in them. The wingspan is 2 2/5 to 3 1/2 inches.