 The second of these two points is more uncontroversial than the first, for it is indubitable that species terms focus more precisely on particular things than generic terms. The first is, however, once again intuitive but not compelling. It appeals to the fundamental intuition that ‘dog’ tells you what Fido is better than ‘brown thing’ does, but does not really give a reason for this claim. Only in  section 3.3,  when we discuss Wiggins’s theory, will we find more formal reasons for treating species or sortal concepts as more revealing of ‘what something really is’ than are other terms.