San Pablo Creek's delta, located within the city limits of Richmond, is known as San Pablo Creek Marsh, and its are filled with an abundance of wildlife, including endangered species such as the California clapper rail, the salt marsh harvest mouse, the threatened black rail, the salt marsh wandering shrew, and the San Pablo vole. Other animals present are the shy salt marsh harvest sparrows which live in the sloughs, while salt marsh yellow throats live among the willows that grow along the transition between fresh creek water and salty bay water.