 It is also home to more than 62 bird species, and the largest nesting site in Panama for the magnificent frigatebird ("Fregata magnificens"), with a population of more than 5000.The island also houses several reptile species, including the black iguana ("Ctenosaura similis") for which the island is named.The refuge also comprises a 40-hectare marine area — including migrating humpback whales ("Megaptera novaeangliae") between June and October — and one of the largest well-preserved coral reefs in Panama, ideal for snorkeling and scuba diving.