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
Reichenau Island Reichenau Island Reichenau Island is an island in Lake Constance in southern Germany. It lies almost due west of the city of Konstanz, between the Gnadensee and the Untersee, two parts of Lake Constance. With a total land surface of 4.3 square kilometres and a circumference of 11 kilometres, the island is 4.5 kilometres long and 1.5 kilometres wide at its greatest extent. The highest point, the Hochwart, stands some 43 metres above the lake surface and 438.7 metres above mean sea level. Reichenau is connected to the mainland by a causeway, completed in 1838, which is intersected between the