Regal Fritillary | Missouri Department of Conservation
Speyeria idalia (Regal fritillary) - Michigan Natural Features Inventory
Re-Thinking Regal Fritillary Conservation and Management: Habitat Characteristics and the Impact of Disturbance Regime on an Imperiled Grassland Butterfly
Regal Fritillary — wisconsinbutterflies.org
Regal Fritillary - Reiman Gardens
Regal Fritillary Butterfly - Species Profile & Facts - Insectic