Historical grazing rights are held by the Long Mynd Commoners which have 48[] ponies on the land. The horses slow the invasion of trees by pushing into the scrub and bracken helping to maintain the heath. They also graze in the pools, eating the pondweed and consequently there is a healthy population of brown trout (Salmo trutta) and otter (Lutra lutra). Tree pipit (Anthus trivialis) and red grouse (Lagopus lagopus scotica) are found here as well as the recent arrival of the grayling butterfly (Hipparchia semele).