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Arboretum: Swallowtails and Bulb Flies

I found two eastern tiger swallowtail butterflies (Papilio glaucus) on a mulch bed at the Arboretum last week. They appeared to be basking in the sun. At times, both would shiver their wings. I assumed one of these butterflies was a male and the other female but, judging from the lack of blue chevrons on their hindwings, they both appear to be male.

Eastern tiger swallowtail butterflies
Eastern tiger swallowtail butterflies

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