The nest of Northern Gannets (Sula Bassana), on the cliffs of Hermaness, composed of discarded fishing rope. Northern Gannet numbers have increased as the birds have adapted to the human fishing industry. They use rope from nets for nesting and will feed on surplus fish thrown back from the fishing boats. The 100 islands of the Shetlands support 23,000 people and a million sea birds. The islands are situated in the heart of UK's pelagic fishing grounds and mark the boundary between North Sea and Atlantic Ocean.