Lepidoptera: Moths and Butterflies - Alex Wild Photography
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When disturbed, a Papilio polyxenes swallowtail larva everts its osmeterium, a foul-smelling defensive organ located behind the head.

Urbana, Illinois, USA

When disturbed, a Papilio polyxenes swallowtail larva everts its osmeterium, a foul-smelling defensive organ located behind the head. Urbana, Illinois, USA

osmeteriumpapilionidaeswallowtail caterpillareastern black swallowtail