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Eastern Tent Caterpillar (Malacosoma americanum)
Toxic
80Six Legs
Bug Bite · From the file on Eastern Tent Caterpillar

Caterpillars concentrate cyanogenic compounds from cherry leaf chemistry into their hemolymph and silk — making them toxic to horses that ingest them.

AgencySmithsonian InstitutionVerified by sources
Read the full file on Eastern Tent Caterpillar

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

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Glasswing Butterfly (Greta oto)
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Glasswing caterpillars eat toxic Cestrum plants and store the alkaloids — making the adults distasteful to predators.

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Seven-Spotted Ladybug (Coccinella septempunctata)
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When threatened, ladybugs 'reflex bleed' — releasing yellow alkaloid-laced hemolymph from their leg joints.

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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