Male fiddler crabs have one small claw and one large one, giving them unusual proportions. In their movement and behavior, soldier crabs simply don't look like crabs. Rather than scurrying everywhere sideways, they move straight.
幽靈蟹行動如風；雄性招潮蟹兩螯一大一小，比例極端懸殊；海和尚行進舉止卻不太像螃蟹，不四處橫行，卻直來直往。