The Palos Verdes blue butterfly is endemic to the Palos Verdes Peninsula in Los Angeles County, California. It is a subspecies of the wide-ranging silvery blue butterfly, a species distributed throughout western North America. It was listed as endangered in 1980, and ongoing threats to this species include habitat conversion through non-native plant invasion and ecological succession, small population size and. Local biologists have worked with the Department of Defense to maintain this subspecies in captivity to guard against extinction since the 1990s.
The Palos Verdes blue butterfly is a member of the family Lycaenidae and has a one-inch wingspan.
Males have a silvery-blue dorsal wing surface with a narrow black border and females have a brownish-gray dorsal wing surface. Both males and females have a gray ventral wing surface with dark spots surrounded by white.
The Palos Verdes blue butterfly inhabits early successional coastal sage scrub.
The land near a shore.
This species feeds on deerweed and Santa Barbara milk vetch as caterpillars.
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