Wild Caribbean reef fish anywhere in the Caribbean. The final island to be featured is Trinidad, cut off from South America by rising sea levels 2,000 years ago. Its island fauna include many mainland species such as red howler monkeys, capuchins and scarlet ibis. Coral reefs, which thrive in the warm, shallow waters around Caribbean Islands, are the subject of the second programme. Hard corals are the reef-builders, and grow their tough external skeletons by extracting nutrients from algae growing within them. Time-lapse footage shows coral polyps emerging at night to trap drifting plankton. Marine life featured includes Caribbean reef squid, octopus
Wuzhizhou Island Wuzhizhou Island Wuzhizhou Island is located off the coast of Hainan Province, China. This 1.48 square kilometre island is situated within Haitang Bay, approximately 30 kilometres northeast of Sanya, between Nanwan Monkey Island to the north, and Yalong Bay to the south. The Taoist priest Wu Huacun of the Qing Dynasty built a house on the island after arriving in search of a place to create the "elixir of life". The island is 1.48 square kilometres with 5.7 kilometres of coastline, and has an irregular butterfly shape. Over 2,700 plant varieties occur on the island, including exotic flowers and trees