May 24, 2022 by mgnvmmfBlack_Swallowtail_Caterpillar_osmeterium_extended_Oct_MMF An eastern black swallowtail caterpillar (Papilio polyxenes) displays its osmeterium.Photo © Mary Free About mgnvmmf Previous Post: « Black_Swallowtail_Caterpillar_osmeterium_extended_Oct_MMF