A female Diana on one of their favorite nectar flowers. They are hypnotized by this Cirsium, a thistle, and can actually be physically lifted off the flowers or photographed until you can't stand it anymore. These are huge butterflies. Larger than any of the Swallowtails. The blue inside is a very difficult color to describe in full light. Blues, turquoises and purples in combination. Note the plain exterior hindwing which is unusual for any Fritillary.