Urocyon littoralis clementae

San Clemente Island Fox

Family: Canidae · Class: Mammalia · Order: Carnivora

Conservation status: G3T1 S2

The San Clemente Island fox is a diminutive subspecies of the island fox, endemic to San Clemente Island in the California Channel Islands. Adults measure approximately 12 to 15 inches (30 to 38 cm) in body length with an additional 4 to 12 inches (10 to 30 cm) for the tail, and weigh between 2 to 6 pounds (0.9 to 2.7 kg). The species exhibits the typical island fox characteristics including a compact body, short legs, and a bushy tail. The pelage is generally grayish with rusty coloration on the sides, neck, and legs, and a distinctive black stripe running down the back and tail. The San Clemente Island fox occurs exclusively on San Clemente Island, the southernmost of the California Channel Islands, located approximately 60 miles southwest of San Diego. This 56-square-mile island represents the entire range of this subspecies. Historically, the population was distributed across the island, but current distribution may be more limited due to past population bottlenecks. The species inhabits diverse vegetation communities across San Clemente Island, including coastal bluff scrub, maritime desert scrub, grassland, and woodland habitats. According to federal documentation, island foxes prefer areas of diverse topography and vegetation, with woodland habitats supporting higher population densities (Federal Register 2004). The subspecies adapts to various elevations across the island's terrain, from coastal areas to interior highlands. San Clemente Island foxes are primarily omnivorous, feeding on insects, small mammals, birds, eggs, fruits, and vegetation. They are generally monogamous and maintain separate territories from other breeding pairs. Breeding typically occurs from late winter to early spring, with females producing litters of 1 to 5 pups after a gestation period of approximately 50 days. The species exhibits both diurnal and nocturnal activity patterns, with peak activity during dawn and dusk hours. The San Clemente Island fox is listed as threatened under California state law, with a global rank of G3T1 indicating it is critically imperiled as a subspecies. The population experienced severe declines in past decades, with the total island fox population across all Channel Islands falling from approximately 6,000 individuals in 1994 to fewer than 1,660 individuals by 2003 (Federal Register 2004). While four other island fox subspecies were federally listed as endangered in 2004, the San Clemente Island subspecies was not included in that federal listing action. Primary threats historically included habitat degradation from introduced ungulates, predation by introduced species, and disease. However, ongoing conservation efforts by the U.S. Navy, which manages San Clemente Island as a military training facility, have focused on habitat restoration and invasive species control. The Navy has collaborated with the U.S. Fish and Wildlife Service for over 40 years on conservation efforts across the island (USFWS Press Release 2024). Current population status and trends for this subspecies require continued monitoring to assess recovery progress and identify ongoing conservation needs.

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, and more.