The Giant Swallowtail (Heraclides cresphontes) or Orange Dog, is a very large (4-6") brown-black butterfly marked with bands of yellow dots on all wing tops. Underside of wing is mostly yellow.
They are found all year in the deep south of the United States, but from May to August they range north to the great lakes and east of the Rocky Mountains.
Their nector sources are lantana, orange blossoms and other citrus plants. The Giant Swollowtail is considered a citrus pest in the south and are subjected to massive spraying.
They are usually found in sunny, open areas, forest edges roads, rivers and citrus groves.