The 'Inaccessible Island Rail' is the smallest flightles bird in the world. Reaching a mere 12.5cm/5inches in length and weighing 35g/1.45oz, this tiny bird can only be found in the southern Atlantic Tristan da Cunha Islands (on Inaccessible Island in the Tristan Archipelago).
An island is a body of land, smaller than a continent, completely surrounded by water. An archipelago is a series of islands that share a common origin, often volcanic. The Big Island of Hawai'i is an island, while the set of islands comprising the state of Hawaii is an archipelago.