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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
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
See photo in original gallery.
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all images and text © Alex Wild 2001-2013