For small flocks, a grazier might do the work single-handedly. For large flocks and stud sheep, graziers will hire shearers, or use a contractor who provides professional shearing teams to do the required work. The grazier would decide on the extent of crutching: the rear of the sheep is almost always shorn, whereas wool around the face, ears, underside and pizzle may also be removed depending on the circumstances such as the weather, length of fleece, and amount of seed or other impurities present in the fleece and the underlying reason for crutching (preventive of fly-strike, or to reduce the likelihood of stain in the fleece wool). Super fine wool Merino flocks are often given a light crutch, known as a New England crutch that removes less of the valuable fleece.