the San Pedro Side-blotched Lizard (Uta palmeri), who feed off of fish scraps leftover by the birds. Sea lion (Zalophus californianus) rockeries also ring the island, housing the fourth most important colony for sea lion breeding in the Gulf of California. The Seri Indians created benches to attract nest building and ease of egg collection, the sole permanent evidence of human intervention visible on the island. In the late 19th and early 20th century guano was heavily mined off the island and shipped as far as Europe for use as fertilizer. Mining boats brought the black rat as an invasive species to the island. The rats were eradicated in the fall of 2007 by spraying rat poison on the island. San Pedro Martir is seldom visited, having near vertical sides leaving only questionable fair weather anchorages in two locations. Landing access was possible near a small isthmus in the southeast of the island, but is now forbidden. In 2005, the island was classified along with 244 others as a World Heritage Site by UNESCO, and included in the Islands and Protected Areas of the Gulf of California. Flora and fauna According to the National Biodiversity Information System of Comisión Nacional para el Conocimiento y Uso de la Biodiversidad (CONABIO) in San Pedro Mártir Island Biosphere Reserve there are over 330 plant and animal species from which 27 are in at risk category and 7 are exotics. References Islands of Sonora Protected areas of Sonora Islands of the Gulf of California Uninhabited islands of Mexico Ramsar sites in Mexico Biosphere reserves of Mexico