 Another objection to species pluralism is that pluralism is an overly liberal position (Sober 1984, Ghiselin 1987, and Hull 1987). Pluralists allow a number of legitimate species concepts, but how do pluralists determine which concepts should be accepted as legitimate? Should any species concept proposed by a biologist be accepted? What about those concepts proposed by non biologists? Without criteria for determining the legitimacy of a proposed species concept, species pluralism boils down to a position of anything goes.