BBC2’s new three-part documentary series Earth’s Tropical Islands explores the world’s most exotic and remote islands, starting with Madagascar　　Escape our ld, dark winter and enjoy a glimpse of the world’s most lourful and amazing islands in BBC2’s new three-part documentary series, Earth’s Tropical Islands, narrated by actor David Harewood.　　First up is Madagascar in the Indian Ocean – the oldest island on Earth and home to more than 15,000 species found nowhere else in the world.