The popular designation of such mouse-like British rodents as are not true or "house" mice. The term thus includes the long-tailed field mouse, Mus (Micromys) sylvaticus, easily recognized by its white belly, and sometimes called the wood-mouse; and the two species of short-tailed field-mice, Microtus agrestis and Evotomys glareolus, together with their representatives in Skomer island and the Orkneys (see Mouse and Vole).