Butterfly: Wingspan: 4 to 6 1/4 inches (8.6-14 cm). The forewing has a diagonal band of yellow spots. Tails are edged with black and filled with yellow. Giant Swallowtails are generally the largest butterflies in Alabama. The sexes are similar, but females may be lighter in color.
ID Tip: Giant Swallowtails are predominately brown on top and creamy yellow beneath. Their flapping wings create a strobe effect.
Egg: Round,dusky orange eggs are deposited singly on host plants.
Caterpillar: Larvae strongly resemble bird droppings. Exact patterns change as caterpillars molt and grow, but they retain the basic brown with cream-and-white patches coloration. Older larvae often rest on twigs; young caterpillars lay on top of leaves--exactly where bird droppings occur Fully grown caterpillars look like small brown snakes when viewed head-on. If frightened, caterpillars heighten the startle effect by rearing back and assuming an angry snake's posture. Bright red osmeteria are extruded, which resemble a viper's tongue. These organs also emit a foul odor.
Chrysalis: Crusty brown. Resembles a broken twig. The overwintering stage.
Giant Swallowtails are impressive: except for the occassional female Eastern Tiger Swallowtail, they are Alabama's largest butterflies. Their flight is strong and graceful, and they often glide significant distances between wingbeats. Look for these butterflies in natural areas that support Prickly Ashes (Zanthoxylum spp.) or Wafer Ash (Ptelea trifoliata). They may also be found in cultivated landscapes that include Rue (Ruta graveolens) and/or citrus trees.
A dot on the county map indicates that there is at least one documented record of the species within that county. In some cases, a species may be common throughout the county, in others it may be found in only a specific habitat.
The sightings bar graphs depict the timing of flight(s) within each of three geographic regions. Place your cursor on a bar within the graph to see the number of individuals recorded during that period.
The abundance calendar displays the total number of individuals recorded within each week of the month. Both the graphs and the calendar are on based data collection that began in 2000.
The records analyzed here are only a beginning. As more data is collected, these maps and graphs will paint a more accurate picture of distribution and abundance in Alabama. Submit your sightings to email@example.com.
Sightings in the following counties: Autauga, Baldwin, Bibb, Blount, Bullock, Calhoun, Cleburne, Colbert, Dallas, Elmore, Escambia, Hale, Houston, Jackson, Jefferson, Lawrence, Lee, Limestone, Lowndes, Madison, Marengo, Marshall, Mobile, Montgomery, Perry, Pickens, Shelby, Sumter, Tuscaloosa
Ranges widely across open areas including herb gardens and citrus groves.
These host plants have been verified in Alabama: Hoptree/Wafer Ash (Ptelea trifoliata), Rue (Ruta graveolens), Sweet Kumquat (Fortunella crassifolia), Southern Prickly Ash/Hercules Club (Zanthoxylum clava-hercules).
Elsewhere in their range, a wide variety of Citrus family (Rutaceae) are reported.
For more information about the documented host plants and/or nectar plants, please visit the Alabama Plant Atlas using the following links:
Giant Swallowtails may be attracted to herb gardens that include Rue (which they may share with Black Swallowtail caterpillars). They may also be attracted to various citrus plants, either potted or in the ground.
Swallowtails are avid nectarers and are especially attracted to native wildflowers such as bee balms (Monarda spp.) milkweeds (Asclepias spp.), Joe Pye Weeds (Eutrochium spp.), Purple Coneflower (Echinacea purpurea), blazing stars (Liatris spp.), and phloxes (Phlox spp.).