Monarch butterfly

Definition

A large, migratory milkweed butterfly (Danaus plexippus, family Nymphalidae) native to the Americas, recognized by its orange wings with black veins and white marginal spots. The species is renowned for its multigenerational, long-distance migration between breeding grounds in North America and overwintering sites in Mexico and coastal California. Larvae sequester cardiac glycosides from Asclepias host plants, rendering adults chemically defended and serving as the model for Müllerian mimicry by the viceroy butterfly (Limenitis archippus).

Etymology

From Greek Danaos (mythological figure) + plexippos (Greek: striking, beating); common name 'monarch' refers to the regal orange and black coloration.

Example

Eastern North American monarch butterflies undertake an annual fall migration of up to 4,000 km to oyamel fir forests in central Mexico, where they enter reproductive diapause and form dense aggregations on tree trunks.

Synonyms

• Danaus plexippus
• wanderer
• common tiger

Related Terms

• milkweed butterfly
• Müllerian mimicry
• viceroy butterfly
• cardiac glycoside
• Diapause
• Migration
• Nymphalidae
• Asclepias

Usage Notes

The term specifically refers to Danaus plexippus, not to other orange-and-black butterflies; distinguish from the viceroy butterfly by size and the presence of a black line across the hindwing in the latter. 'Monarch' alone is common in informal and conservation contexts. Regional common names (wanderer, common tiger) reflect its wide distribution; 'milkweed' as a common name is ambiguous with the host plant genus.