Colorado’s silverspot butterfly has been listed as endangered under the Endangered Species Act. The butterfly inhabits southwestern Colorado, and by classifying it as endangered, U.S. Fish and Wildlife is hoping to protect some of its habitats.

“While the silverspot butterfly is not in immediate danger of extinction, the best available scientific information indicates that it is likely in danger of extinction in the foreseeable future.”

Although S. n. nokomis has survived through severe and sustained drought over past millennia, future habitat conditions may preclude its survival especially if the climate changes as projected in scenarios 3 and 4. Chapter 4 assesses future condition for S. n. nokomis

Why?

Habitat loss and fragmentation; livestock grazing; human-caused hydrologic alteration; and genetic isolation are considered major factors influencing the species and can affect the 3 R’s and species viability.

However, if implemented properly, mowing for native hay, grazing, and burning can be compatible and beneficial for S. n. nokomis. Populations of S. n. nokomis are genetically isolated due to intermittent occurrence of suitable habitats throughout their range.

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The silverspot butterfly is relatively large with up to a 3-inch wingspan. The males are typically

bright orange on the upper side and females are typically cream to light yellow with brown or

black. The underside wings of both sexes have silvery- white spots giving them their generic

common name of silverspot butterfly. The butterfly completes its entire life cycle in one year.

Chapter 2 provides identification of the different life stages of S. n. nokomis, the taxonomy and

genetics of the species, the distribution, habitat requirements, life cycle, and ecological needs of

individuals, populations, and the species.

Tell me about the Silverspot butterfly? 

When did its numbers first become concerning?

Why? What is causing their numbers to decrease?

What is being done about it?

Why is this important? 

What’s leading to habit loss? What are their current numbers? What is being done to combat extinction? Could talk to a Colorado lepidopterist as well as a source from U.S. Fish and Wildlife.