In sheep farming, the term Mule is used to refer to a cross between a lowland ram (usually a Bluefaced Leicester) and a purebred upland (or hill) ewe. The hill ewe, for example the Scottish Blackface, is a hardy animal with good, natural mothering instincts. She is, however, not very prolific and tends to produce one lamb: suited to the harsh conditions. The lowland ram, such as the Blueface Leicester is prolific, producing ewes which give 1-3 lambs and capable of producing enough milk to rear them. The cross between the two, in this case the Scottish mule, has good mothering instincts and good sized lambs.