as Middle Rock, is host to the northernmost nesting colony of brown boobies on the west coast of North America. Ten species of reptiles and amphibians are also found on the islands. The best known is the Coronado rattlesnake (Crotalus oreganus caliginis''), which is a smaller subspecies than the one found on the mainland. There is also the Coronado Island gopher snake, which feeds off birds' eggs, the Coronado skink, which is found on all four islands, and the arboreal salamanders which live on the three biggest islands. Southern alligator lizards are found on the north, south and central islands. There are two types of land mammals on the islands: rabbits and mice. How they reached the islands is currently unknown. Sea mammals are plentiful and it is not uncommon to see groups of California sea lions and seals. Middle Island is home to a small colony of northern elephant seals. References External links Islas Coronado Mexico Photo Gallery https://web.archive.org/web/20120722175550/http://diver.net/seahunt/maps/coronodos.htm This links to a news article about the use of one of the islands as a waypoint for illegal migration to the United States. November 2010 Islands of Tijuana Municipality Pacific islands of Mexico California chaparral and woodlands Islands of Baja California