Five, see text Euchloe ausonides, the large marble[1] or creamy marblewing,[2] is a species of butterfly that occurs in western North America.

[4] The caterpillar is a dark green to a bluish gray color that is covered in black dots.

[6] Euchloe ausonides tend to live in open, sunny areas such as valleys, hillsides, fields and meadows.

Host plants, including the field mustard (Brassica rapa), are quite common in the San Juan Islands.

The males will draw near white paper models, other light butterflies and other Euchloe individuals within about 20 cm.

Because of its rarity and fragility, this butterfly officially listed under the Endangered Species Act (ESA) as of May 4, 2020.

Organizations such as US Fish and Wildlife Service (USFWS), Washington Department of Fish and Wildlife, the San Juan Preservation Trust, The National Park Service, and even a host of private landowners, schools, and concerned citizens have taken a stand to help conserve these endangered butterflies.

[8] To help local landowners understand and distinguish island marble butterflies, USFWS and Washington Department of Fish and Wildlife worked together to develop information in order to provide voluntary guidelines for producing and managing island marble habitat.

[11] Although the island marble has been listed and is now protected under the Endangered Species Act, the rare butterfly still faces many threats.

[12] In addition to the deer, there are also threats from non-native grazers introduced by people, including invasive European rabbits and snails, which also eat much of the native vegetation.