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Giant Swallowtail (Papilio cresphontes)
Toxic
81Six Legs
Bug Bite · From the file on Giant Swallowtail

Caterpillars have an OSMETERIUM — a forked orange organ that protrudes from a slit behind the head when threatened, releasing a foul-smelling chemical that deters predators.

AgencyRoyal Entomological SocietyVerified by sources
Read the full file on Giant Swallowtail

More Toxic bites

Bullet Ant (Paraponera clavata)
Toxic
Six Legs92

Bullet ant venom contains poneratoxin, a peptide that paralyzes insect prey and is being studied as a template for next-generation insecticides.

Bullet AntVerified by sources
Glasswing Butterfly (Greta oto)
Toxic
Six Legs77

Glasswing caterpillars eat toxic Cestrum plants and store the alkaloids — making the adults distasteful to predators.

Glasswing ButterflyVerified by sources
Seven-Spotted Ladybug (Coccinella septempunctata)
Toxic
Six Legs63

When threatened, ladybugs 'reflex bleed' — releasing yellow alkaloid-laced hemolymph from their leg joints.

Seven-Spotted LadybugVerified by sources
Monarch Butterfly (Danaus plexippus)
Toxic
Six Legs83

Monarch caterpillars accumulate cardiac glycosides from milkweed — making the adults toxic to most predators.

Monarch ButterflyVerified by sources
Giant African Millipede (Archispirostreptus gigas)
Toxic
Six Legs73

When threatened, giant millipedes release a defensive secretion containing benzoquinones and hydrogen cyanide.

Giant African MillipedeVerified by sources
Madagascan Sunset Moth (Chrysiridia rhipheus)
Toxic
Six Legs73

Caterpillars eat toxic Omphalea plants and store the alkaloids — the brilliant adult colors warn predators 'I'm poisonous.'

Madagascan Sunset MothVerified by sources