Elk, sometimes confused with bison, were initially described by Miguel Costansó in his diary of the 1769 Portola Expedition near the mouth of the Pajaro River both on the way north on October 6, and on the way south on November 25. Later, elk were also described by nineteenth century American hunters. They were also described in Santa Cruz County by Jlli tribelet Awaswas Ohlone people, who utilized elk along with pronghorn ("Antilocapra americana") and lived on the Jarro Coast (El Jarro Point is north of Davenport, California). Additionally, there is a "Cañada del Ciervo" ("ciervo" is Spanish for "elk") close to the boundary between Rancho de los Corralitos and Rancho San Andrés, near the present-day Larkin Valley Road. This "Elk Valley" place name was given by José Antonio Robles who rode down, roped, and killed elk there in 1831. Lastly, elk remains dating from the Middle and Late Periods in Northern California were found in at least four late Holocene archeological sites in Santa Cruz County, all coastal: SCR-9 (Bonny Doon site) and SCR-20 (Brown site) on the western slope of Ben Lomond Mountain, SCR-93 (Sunflower site) a coastal terrace on the north shore of the San Lorenzo River in Santa Cruz, and SCR-132 (Scott Creek site) 4 miles inland. Pronghorn antelope ("Antilocapra americana") remains were found at the SCR-20 (Brown site) on the western slope of Ben Lomond Mountain dating to about 1500 A.D.  Año Nuevo State Marine Conservation Area, Greyhound Rock State Marine Conservation Area and Natural Bridges State Marine Reserve are marine protected areas off the coast of Santa Cruz County. Like underwater parks, these marine protected areas help conserve ocean wildlife and marine ecosystems. The county of Santa Cruz has experienced demographic fluctuations in recent history. Between 1990 and 2000, population increased 11.3%. This is primarily not because of immigration or migration, but because of new births. In 1980, Santa Cruz county was 21% Latino, which rose to 28% in 1990 and 39% in 2000. The area between Watsonville in south Santa Cruz County and Salinas Valley of northern Monterey County is primarily Latino. The 2010 United States Census reported Santa Cruz County had a population of 262,382.