St Kilda lies isolated in the Atlantic 40 miles off the western isles of Scotland and is a dual Unesco World Heritage site for Cultural and Natural importance. The archipelago of small, steep volcanic rock holds the largest colonies of Gannet in the world, the northern hemisphere largest sea bird. Humans have lived here for centurie enjoying the most fettles soils int he western isles and having a mixed diet of seabird meat, seafood, livestock and crops. The main island Hirta supported around 180 people at its peak with last islanders leaving in 1933. Today a radar station keeps a couple of dozen staff all year and a number of volunteers for the National Trust for Scotland who tend the village in summer.