Swallowtail Butterfly Differences
NJ has 4 mostly dark species of Swallowtails, and it's not always easy to tell them apart. I've found this webpage to be useful in figuring them out.
It was also helpful when I was trying to ID what turned out to be a Red-spotted Purple with wing damage; I had thought the swallowtail part of the back wing had been bitten/torn off, only to discover it wasn't a Swallowtail at all.
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