A bipedal (or multipedal) non-humanoid robot or mecha that walks on legs. They usually lack a head or arms and some have chicken-like reverse-jointed legs. The AT-ST and AT-AT from Star Wars and the Tripods from War of the Worlds are arguably the most recognizable examples of this style of mecha design. Do not confuse these for regular mechas - if it's humanoid it's typically not a walker.