Belding’s Sparrow (Passerculus sandwichensis beldingi) is one of the 17 currently recognized subspecies of the Savannah Sparrow (Wheelwright and Rising 2008). It can be found in saltmarshes from Point Conception, California, to the estuary of Arroyo El Rosario, Baja California (Van Denburgh 1924, Zembal et al. 1988, Wheelwright and Rising 2008) and since 1974 has been designated as endangered by the California Department of Fish and Wildlife. Bradley (1994) suggested that this subspecies is largely isolated, with a low capability for dispersal, and Powell and Collier (1998) found no movement in or out of a marsh on San Diego Bay isolated by only 0.5 km from the next nearest marsh.