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Papilio eurymedon

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Papilio eurymedon

Pale Swallowtail
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Papilionidae
Genus: Papilio
Species: P. eurymedon
Binomial name
Papilio eurymedon
Lucas, 1852

The Pale Swallowtail or Pallid Swallowtail (Papilio eurymedon) is a relatively common swallowtail butterfly found throughout much of the western United States. It is found on the Pacific coast from northern Baja California to southernmost British Columbia and inland to New Mexico and the Black Hills of South Dakota. It is present from the coast to western Montana and Wyoming to northern New Mexico. It is absent from most of Nevada and western Utah. It prefers open woodlands and forest clearings, especially near permanent bodies of water such as ponds, but also urban parks and occasionally is seen in suburban areas. Though not as common as the Western Tiger Swallowtail, the Pale Swallowtail can be seen in large numbers at puddling parties where up to a dozen or more males may be seen gathered. There they join other species to sip water from damp soil to obtain nutrients for mating. Their appearance is quite similar to that of the Western Tiger Swallowtail except they are a white-cream color or very pale yellow. Some Pale Swallowtails also have differing amounts of red-orange patches on the wings just above the tail as well as on the . Tiger stripes and borders are thicker than those of Western Tiger Swallowtails. The wingspan is typically 3.5 to 4.5 inches.

The Pale Swallowtail has a single osmeterium which pops out from behind the head and releases a foul odor to warn off predators. Caterpillars turn brown just before the fifth moult. The pupa is brown and looks like a piece of bark. As they pupate they face upright, secure the tip of the abdomen to a branch with a silk thread, and hang freely.

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