The San Joaquin kit fox (Vulpes macrotis mutica) is a subspecies of the kit fox, the smallest member of the dog family in North America. They are on the on the U.S. Endangered Species List. San Joaquin kit foxes inhabit grasslands and scrublands, many of which have been extensively modified.
Oak woodland, alkali sink scrubland, and vernal pool and alkali meadow communities also provide habitat for kit foxes. Dens are scarce in areas with shallow soils because of the proximity to bedrock, high water tables, or impenetrable hardpan layers.
Kit foxes are active year-round and are primarily nocturnal. Prior to construction of Los Vaqueros Dam, potential San Joaquin kit fox burrows were checked for activity. Plans called for moving kit fox families away from construction areas if they were discovered.
CCWD also placed culverts below the relocated Vasco Road, to help assure that the foxes can cross below the road to safety.