21. There are several habitats in the national park, a savanna, mangroves, montane and mixed-monsoon forests, and coral islands . 22. Since Taiping island is a coral island , the surface includes fine sand and coral reefs formed by weathering. 23. At the southern end of the peninsula is a series of coral islands , known as the Florida Keys. 24. When Yan Fei and Yan Xing got back to Coral Island , Wenxin refused to meet both father and son. 25. Charles Darwin believed it was only found on " a single coral island north of the Society group ". 26. But it did in 1947 as adventurer Thor Heyerdahl sailed from Peru to Raroia, a coral island near Tahiti. 27. As a coral island ( a raised coral atoll ), it rises a mere 42 m above sea level. 28. Aniwa Island is the only coral island , the other four are volcanic and reach much higher elevations than Aniwa. 29. Glover has preached on the 260 square-kilometer ( 100-square mile ) coral island of 2, 300 people for five years. 30. They nest on coral islands , usually on trees with thin branches but also on rocky ledges and on man-made structures.