They are classed as 'at risk' because of the threats to them. 6) Herdwick sheep are 'hefted'; which means they hold (without fences) to a place on the fell (mountain) because they are taught a ...

Sheep have grazed on the moors for centuries ... said the plans would "destroy the ancient traditional hefted flocks" of Dartmoor and have a "significant adverse impact on farm businesses".