Shepherded sheep flocks are sheep flocks that are led by a shepherd, who is assisted by one or two dogs. The Stichting Behoud Drentse Schaapskudden (the Foundation for the Preservation of Sheep Flocks in Drenthe) covers the sheep flocks from Orvelte, Ruinen, Exloo, Balloërveld and Holtinge. The flocks graze in natural areas and play a significant role in nature conservation. Letting areas be grazed by sheep fits into a well-considered management of the eco-system. The shepherds are very concerned with the cultural-historical value of their profession. Their flocks consists of the old sheep breeds from Drenthe, the Drents heideschaap (Drenthe heath sheep) and the Schoonebeeker. These sheep feel absolutely comfortable on the poor heathland. The shepherds of the flocks are working towards the preservation and improvement of these two races. The shepherds drive their flocks nearly throughout the year from the fold to the heath in the morning. The dogs are deployed to keep the flocks together. The flocks often attract public. At special occasions tourists are warmly welcomed; think of Lambs Day, sheep-shearing festivals and demonstrations sheep herding.