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
Inch Island Inch Island Inch Island () ) is an island in Lough Swilly, County Donegal, Ireland. The island is around 5 square miles (13 square kilometres) in area. It lies off the Donegal coast near Burt and the start of the Inishowen peninsula; Inch island is connected to the mainland by a causeway road. The island's highest hill is at 222 m. The table reports data taken from "Discover the Islands of Ireland" (Alex Ritsema, Collins Press, 1999) and the Census of Ireland. The remains of a portal tomb with a nearby burial chamber probably constructed using parts of the original