Gulf Fritillary (Agraulis vanillae)
The Gulf fritillary is a medium-sized, orange butterfly with black markings and somewhat elongated wings. Its hindwings below are covered with numerous silvery, mercury-like patches that distinguish this butterfly from the similar and equally common monarch. Fond of open, disturbed sites, the Gulf fritillary frequently stops to nectar at colorful flowers and is a very common garden visitor. The Gulf fritillary is one of several migratory species in the Southeast. As fall approaches, adults begin a mass southward migration eventually arriving in the warm confines of South Florida to overwinter.
Female Gulf fritillaries deposit small, yellow eggs singly on the leaves or tendrils of the host plant. The mature larva is bright orange with conspicuous black spines. Although the larvae are solitary feeders, they often occur in very large numbers and can quickly defoliate passionflower vines. For this reason, gardeners may wish to occasionally “thin” or remove some larvae to insure that there is enough food to go around for the other hungry mouths, and enough leaves to keep the vine alive. The pupa (or chrysalis) is light brown and closely resembles a dead leaf.