There are more than 120 species of butterflies in western Pennsylvania, and the North American Butterfly Association wants ...

Sylvia Garcia took this photo of a Western Tiger Swallowtail butterfly (Papilio rutulus) as it was nectar-feeding on a ...

Jeffery Starn and Jessica Hamel submitted this photo of an Anise Swallowtail (Papilio zelicaon) that was taken during a hike ...

The larger Papilio glaucus group includes various swallowtails long studied for their vivid appearance and ecological variety. Their different preferences for temperature and region have served as a ...

An eastern tiger swallowtail (Papilio glaucus) is a common enough sight, but this one catches your eye. Something is different here. Astounding, even. At closer look, it appears as if two butterflies ...

The butterfly appears to be a hybrid between two known tiger swallowtail species — P. glaucus and P. canadensis — but because it lives in a range where neither of these species are present ...

For example, if a butterfly like Papilio glaucus were transferred to a genus with a feminine name, the epithet glaucus (masculine form) would be adjusted to glauca to agree in gender with the new ...

For example, if a butterfly like Papilio glaucus were transferred to a genus with a feminine name, the epithet glaucus (masculine form) would be adjusted to glauca to agree in gender with the new ...

Small cones studded with dangling red seeds appear after the flowers fade. Birds and small mammals consume the seeds. Sweetbay magnolia is a larval host plant for the Eastern Tiger Swallowtail ...