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The Two-tailed Swallowtail is a large swallowtail of western North America, one of several species that have yellow wings with black tiger striping. Each hindwing has several blue markings (top and bottom).
Host plants include: chokecherry, bitter cherry, Arizona rosewood, single-leaf ash, hoptree, and Arizona sycamore. In California it mostly uses California hoptree. Elsewhere in the West, it often uses green ash planted along city streets (in California, city habitats are usually occupied by Western Tiger Swallowtails rather than Two-tailed)