Soay sheep are seen in France in 2004. Climate change has caused a flock of wild sheep on a remote northern Scottish island to become smaller, according to an unusual investigation published on Thursday. The wild Soay sheep live on Hirta, in the St. Kilda archipelago in the storm-battered Outer Hebrides, and have been closely studied for nearly a quarter of a century.(AFP/File)AFP - Climate change has caused a flock of wild sheep on a remote northern Scottish island to become smaller, according to an unusual investigation published on Thursday.