St Kilda is the remotest part of the British Isles, west of Benbecula in Scotland's Outer Hebrides. Internationally recognised for its birdlife, St Kilda is no less famous for its human history. A community existed here for at least 4,000 years, exploiting the dense colonies of gannets, fulmars and puffins for food, feathers and oil. Those who make the long journey to St Kilda are rewarded with an abundance of things to see (and hear), from two of the highest sea stacs in Britain (Stac an Armin and Stac Lee) to a world-renowned colony of almost 1 million noisy seabirds. St Kilda is also home to its own sub-species of wren, its own sub-species of mouse (twice the size of a British fieldmouse) and a primitive breed of sheep.