Milkweed Bug vs Big-legged Bug

Side-by-side species comparison

Attribute Milkweed Bug Big-legged Bug
Scientific Name Oncopeltus fasciatus Acanthocephala terminalis
Order Hemiptera Hemiptera
Family Lygaeidae Coreidae
Size 10-13 mm 17-23 mm
Habitat Grasslands Underground
Diet Seed Feeders Sap Feeders
Regions North America, Central America Eastern North America
Conservation Least Concern Least Concern

Milkweed Bug

A medium-sized bug with bold orange-red and black warning coloration. It feeds on milkweed seeds and sequesters toxic cardiac glycosides for its own defense.

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Did You Know?

This bug has become a widely used laboratory model organism because it is easy to rear, has no diapause requirement, and displays clear warning coloration.

Big-legged Bug

A large, dark coreid bug found in eastern North America with prominently expanded hind tibiae. The hind femora of males are greatly swollen with large spines. It feeds on a wide variety of trees and shrubs.

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Did You Know?

The exaggerated hind legs of males serve as weapons and signals of fitness, with larger-legged males winning more fights and mates.