Martens are larger, heavier-bodied animals than weasels, with thick fur and bushy tails.
Members of most species are brown above and light-colored below. The American marten, Martes americana, also called American pine marten and American, or Hudson Bay, sable, is from 20 to 25 in. It lives in coniferous forests from Alaska to the extreme N United States, extending south in western mountain ranges. Similar to the American marten are the European pine marten, M. martes, and the stone, or beech, marten, M. foina, of Europe and central Asia. The stone marten is grayish.