Regal Fritillary
A Regal Fritillary turns a Kansas prairie remnant into a complete life-cycle map: orange forewings above, black spotted hindwings behind, nectar flowers for adults, and violets waiting below for spring larvae.
Artwork inspired by John Steuart Curry
Regal Fritillaries are large prairie butterflies with bright red-orange forewings marked in black and dark hindwings carrying two rows of pale spots. In the outer hindwing row, male spots are orange while female spots are white. Their low steady patrol flight differs from the restless flutter of many smaller orange butterflies.
Adults nectar at milkweeds, thistles, red clover, and mountain mint, but caterpillars depend on violets. Females scatter eggs in late summer; newly hatched larvae overwinter without feeding, then seek violet leaves in spring. A viable site therefore needs more than summer flowers—it needs intact prairie structure, host plants, and management that leaves refuges through fire and other disturbance.
- Wingspan
- About 2⅝–4⅛ inches
- Sex clue
- Outer hindwing spots orange in males, white in females
- Life-cycle link
- Adults use nectar flowers; larvae require violets
Quick guide
- Identify the adult in two wing zones
- Red-orange black-marked forewings plus black hindwings with two spot rows
- Audit two generations of habitat
- Adult nectar flowers now; native violet leaves for spring larvae
Separate adult identification from the prairie requirements of the next generation
- Begin with the complete dorsal pattern
- Watch from a Kansas prairie trail for a large butterfly with a low steady flight.
- Compare the outer hindwing row
- Use binoculars or a photograph to read the outer row without chasing the butterfly.
- Follow adult resources only from the trail
- Watch one voluntary nectar stop at milkweed, thistle, red clover, or mountain mint and record the flower.
- Read the next generation in the prairie
- Look elsewhere along the established route for native violets, intact litter, unmowed refuge, and a patchy recent-burn pattern.
Good to know
The flower beneath an adult and the violet needed by its larva solve different life-stage problems. A strong Regal Fritillary record names both resources separately rather than treating any nectar-rich prairie as complete breeding habitat.
Notice these
- Large red-orange forewings
- Black hindwings with two spot rows
- Sex-specific outer hindwing spots
- Prairie-violet larval dependency