Invertebrates
Great Spangled Fritillary
Speyeria cybele · also called great spangled fritillaries
A great spangled fritillary caterpillar hatches in the cooling days of autumn and immediately does nothing at all, settling into a dormant wait through an entire winter before the violets it depends on finally return the following spring.
Overview
The great spangled fritillary, Speyeria cybele, is native to grassland, meadow, and forest edge habitat across a broad range spanning much of the United States and southern Canada. Its striking silver-spangled underwing pattern, unusual overwintering strategy of hatching before food is even available, and complete dependence on violets as a caterpillar make it one of the more visually and behaviourally distinctive fritillary butterflies in North America.
A life cycle timed around a plant that isn’t there yet
By hatching in autumn rather than spring, this species’ caterpillar faces a genuine gap between emergence and food availability, a challenge it solves simply by waiting through the entire winter in a dormant state until violets return.
Status
Least Concern — widespread and stable across suitable grassland and forest edge habitat throughout most of the United States and southern Canada.
Great Spangled Fritillary: common questions
Why does the great spangled fritillary caterpillar wait all winter without eating?
This species hatches from its egg in autumn, well after the violet plants its caterpillar depends on have already died back for the year, so rather than searching for unavailable food, the newly hatched caterpillar enters a dormant state and simply waits through the entire winter until spring, when fresh violet growth finally becomes available to eat.
Why is it called the great spangled fritillary?
This species displays a series of large, metallic silver spots across the undersides of its hindwings, a bold and distinctive pattern often described as spangled, and combined with its notably large size compared with several smaller fritillary relatives, this gave the species its full common name.
Why does the great spangled fritillary depend so heavily on violets?
The caterpillar can develop successfully only on violet leaves, so the species' overall distribution and local abundance closely tracks wherever violet plants are naturally available within grassland, meadow, and forest edge habitat, meaning the loss of violets from a given area can directly limit whether this butterfly can be found there.
How many generations of great spangled fritillary are there each year?
This species produces only a single generation annually, with adults flying through the summer months before the next generation's eggs are laid in autumn and immediately enter dormancy without feeding, a life cycle pattern different from some other butterfly species that complete multiple generations within a single year.