Jack rabbit near the South McCoy Trail

The estuary supports a mammal population typical of fields and lowland habitats.

Rodents, including mice, the California ground squirrel, and cottontail rabbits, are most common, providing an important food source for the raptor population of the upper estuary. Coyotes, raccoons, bobcats, striped skunks, and the long-tailed weasel are also present in the Reserve (Taylor and Tiszler, 1989). The San Diego black-tailed jackrabbit, a California species of special concern, inhabits the southern portion of the Reserve.  You can see the jackrabbit bounding through the coast cholla cactus stands on the southernmost trails of the Refuge and Reserve (pictured above).