We took a wee side trip to stare into Tahquamenon River, way in the upper reaches…I estimate only some 15% of the catchment is upstream of this spot—for whatever it’s worth. 😉
We found four of these spell-binding swallowtails (if you can tolerate butterflies) flitting about on the boat launch apron next to the bridge.
The Guru calls it Take-Home-A-Sac (sarcastic harhar).