 A general hallmark of vagueness is that it involves borderline cases: possible cases that are neither clearly in the extension of the vague term nor clearly not in its extension. An alternative characterization involves fuzzy boundaries rather than borderline cases (see Fara 2000, 47–48). Cases of ambiguity can be like this: one can imagine a sorites series involving something that is clearly a baseball bat at t1 that is changed particle by particle into a chiropteran with borderline cases of each mid-series, thus being a vague case of ‘bat’ in both senses. However, ambiguity need not be characterized by borderline cases nor by sorites-series susceptibility.