The Cuban rock iguana, seen above at Guantanamo Bay's Camp 4 in May 2008, thrives inside the U.S. Navy base. Often eaten in Cuba's protein-poor communities, the iguana is listed as vulnerable on the International Union for Conservation of Nature's Red List of Threatened Species.

Thanks to protections provided by the base, the IUCN estimates that Guantanamo Bay--despite its relatively small size--contains anywhere from 6 to 8 percent of the Cuban iguanas living on the island country.

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