...they did rear birds especially for sport (if they hadn't there would not have been enough birds to shoot, particularly in the case of grouse shooting and especially as moorland is a man-made habitat, maintained by man, and they are partly maintained as a means of rearing grouse. See this link National Parks: Moorland.) and they began to have beaters from around 1790, as you will see if you read my post above, "The rearing of pheasant and grouse".