Some campaigns will have characters (or animals, monsters, etc.) with traits beyond the human norm. In particular, characters with Strength and Speed well above or below the human range are common in role-playing games. Examples include giants, superheroes, pixies, aliens, ogres, intelligent rabbits, robots, etc.
In Fudge, Strength, Mass and Speed are rated by the GM in terms of Scale for different races. Most other traits that may be different for non-humans are handled with a Racial Bonus or Penalty rather than being on a different Scale see Section 2.35. Of course, the GM may assign any trait she wishes in terms of Scale.
Humans are of Scale 0, unless some other race is the game-world norm. (E.g., if all the PCs are playing pixies or giants. In these cases, the PCs’ race is Scale 0, and humans would be a different Scale.) Non-human races can have a positive or negative number for Scale, depending on whether they are stronger (or bigger or faster) or weaker (or smaller or slower) than humans.