Small Milkweed Bug vs Assassin Bug

Side-by-side species comparison

Attribute Small Milkweed Bug Assassin Bug
Scientific Name Lygaeus kalmii Zelus renardii
Order Hemiptera Hemiptera
Family Lygaeidae Reduviidae
Size 10-12 mm 12-20 mm
Habitat Grasslands Farmland
Diet Predators Predators
Regions North America North America, South America
Conservation Least Concern Least Concern

Small Milkweed Bug

A boldly patterned red-and-black seed bug that feeds on milkweed seeds and sequesters toxic cardiac glycosides. Its warning coloration advertises its chemical defense to predators.

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Did You Know?

It stores milkweed toxins in its body, making it taste terrible to birds and other predators that try to eat it.

Assassin Bug

Ambush predators that impale prey with their curved beak and inject lethal saliva. Some species coat their legs with sticky plant resin to trap prey. Named for their hunting strategy.

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Did You Know?

Some assassin bugs stack the corpses of their prey on their backs as camouflage and armor — creating a gruesome shield of dead ants and other insects.