Ever since her first encounter with a Scarf as they are known locally when she was a child and her Mum rescued a casualty of an oil spill, Helen Moncrieff, Shetland Manager for RSPB Scotland has had a particular fondness for these birds seeking them out in in the darkness of sea caves where they nest on ledges and fill the air with their strange sounds.

Producer: Sarah Blunt
Photograph: Paul Lee.