Gamekeeping is the management or control of wildlife for the well-being of game and may include the killing of other animals which share the same niche or predators to maintain a high population of more profitable species, such as pheasants introduced into woodland. In his 1933 book Game Management, Aldo Leopold, one of the Western pioneers of wildlife management as a science, defined it as “the art of making land produce sustained annual crops of wild game for recreational use”.