Ailsa Craig is a small granite island in the Firth of Clyde off the coast of Scotland. The island is a bird sanctuary home to large numbers of various species of birds including gannets, razorbills, kittiwakes, herring gulls, shags, fulmars, puffins and black-backed gulls.
Ailsa Craig is also the world's major supplier of a rare type of micro-granite with a highly-interlocked, finely-grained mineral structure free of quartz, which is used to make stones for the sport of curling. More than two-thirds of all curling stones originate from this tiny volcanic pug.
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