Eastern Black Swallowtail (Papilio Polyxenes larvae; late stage before pupation.
Seen here chillin' on its primary host plant, the herb fennel.
Photo with my finger on its back shows the expression of the orange y-shaped 'osmeterium', an organ which exudes a rather-unpleasant "stink-bug-like" odour in response to unwanted, aggressive attack.
After washing my hands four times, since, I can still smell it....
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