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Black Swallowtail caterpillar
Papilio polyxenes
42.3769, -72.486
Field Notes
Notes:
On Water Hemlock, Cicuta maculata. I was tempted to annoy it to see if it would extend its osmeterium but I decided to let it be. Although Water Hemlock is in the Apiaceae I don't know if it is a regular host plant for these caterpillars.
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