We explore two ways of distinguishing the semantic operation of kind terms. First, we focus on a distinction between terms with a flexible versus terms with an inflexible semantics. Flexibility depends on whether some changes in the domain of application are taken to be possible while being consistent with past usage and what is intuitively the same meaning. On the other hand we discuss terms whose mode of operation is tolerant, in that the cohabitation in the speakers’ community of more (...) than one use or practice of use of the term in question is accepted. Those terms contrast with terms that operate in a strict way restricting severely the legitimacy of different uses that cut the domain of application in different ways. Among the latter we include terms with an ethical component and terms whose correct application involves high stakes. These distinctions are not new, since the phenomena that we identify as flexibility and tolerance have been observed, although in our view they have not been properly systematized and assessed. We argue that the two distinctions throw light on the bases of some disputes and on some legal disagreements. (shrink)

This paper uses two case studies to explore an interest-relative view of taxonomy and how it complements kind pluralism in biology. First, I consider the ABC island bear, which can be correctly classified into more than one species. I argue that this classificatory pluralism can be explained by reference to the range of alternative explanatory interests in biology. In the second half of the paper, I pursue an interest-relative view of classification more generally. I then apply the resultant view to (...) a second case study: whether whales are fish. I argue that this question is not one about scientific vs folk usage, as has been assumed. I also develop a new view: that Fish should be rejected as a category, both from the point of view of biological science, and from the point of view of folk taxonomy. Along the way, I use the interest-relative view to shed light on the circumstances under which higher taxa should be accepted as legitimate categories for biological science. (shrink)