Print Logo

Regal Fritillary Butterfly


Regal Fritillary Butterfly

The regal fritillary is currently listed as threatened in Illinois, with reduced numbers. Today, the fritillary is found in less than 5% of its historic range within the Chicago Wilderness Region, as prairie removal has decimated its habitat. The Chicago Academy of Sciences / Peggy Notebaert Nature Museum is working to assess potential homes for the regal fritillary and develop techniques for breeding this fragile species.

Jump To: About the Regal Fritillary | What is the Museum Doing? | Lifecycle | How Can I Get Involved? | Meet the Expert | Related

About the Regal Fritillary

Although it is not formally named the Illinois state butterfly, some might argue that the the regal fritillary, with its beautiful blue-black wings and prominent white spots, is an Illinois icon. But while the species may seem abundant in the prairies of the Prairie State, its population has seen visible declines east of the Mississippi River, in part due to much of its habitat becoming replaced by shopping malls and suburban sprawl. Biologist Doug Taron and the team at the Peggy Notebaert Nature Museum seek to better understand these butterflies and their living conditions so they can help to preserve the species.

Regal fritillary butterfly

What the Museum is Doing to Help

The regal fritillary has an unusual breeding pattern – its caterpillars hatch right before the cold season begins. These tiny but mighty caterpillars are built to survive the cold, but only when conditions are at the perfect temperature and humidity levels. This is where the team at the Nature Museum comes in to help.

Scientists at the Museum are working to help caterpillars breed in the laboratory and survive the winters under conditions that mimic their ideal outdoor climate. Using the Baltimore checkerspot as a model for the complex climate needs that both species require, Nature Museum experts continue to work to get closer to helping caterpillars thrive during this time for a healthy release in the springtime.

A Complex Lifecycle

Regal fritillaries face many challenges during the course of their life cycle. Here are a few of the ways the butterfly poses obstacles for its own survival.

• The regal fritillary caterpillars will only feed on one very specific flower – violets. Not only are these rare flowers its sole source of nourishment, but the violets must also be located in prairies, as the caterpillars will not take to violets in gardens or woodlands.

• The species also lays its eggs late in the season (around the end of August or September) near the violet plants on which the caterpillars will feed.

• Because violets bloom much early in the season by the time they set seed they tend to be hidden beneath other plants, it can be tricky for ecologists and botanists to find them and gather their seeds. As a result, violets continue to be rare on restored prairies. Because eggs are laid as late as September, the tiny caterpillars that hatch live through a cold winter before entering into adulthood in the spring. The Nature Museum continues to work to replicate these conditions in its butterfly lab, as it aims to maintain the populations of several butterfly species.

Regal fritillary caterpillar

How Can I Get Involved?

Become a volunteer, and help spot butterflies. Currently, there are over 100 people counting butterflies on behalf of the Illinois Butterfly Monitoring Network each year. This data is informing conservation strategies for butterflies across the state.

Meet the Expert

“It’s incredible to me that these butterflies survived evolution. Being so reliant on violets, a fleeting resource, this very narrow window of time that both the flowers and the caterpillars are active is crucial to the survival of the species.”  Doug Taron, PhD

Doug Taron, PhD, is the Chief Curator of the Chicago Academy of Sciences. He founded the Illinois Butterfly Monitoring Network in 1987, a volunteer organization that monitors the health of butterfly populations in nature preserves.


Blog Post: How Many Legs Does a Caterpillar Have?

News Story: Chicago Tribune, Sept 2017: Illinois vanishing bugs and why it matters to Earth

Mobile navigation