A popular alternative view, pragmatism, espoused by philosophers such as Philip Kitcher and John Dupre states while species do not exist in the sense of natural kinds, they are conceptually real and exist for convenience and for practical applications [REF].
Several authors have noted the similarity between "species", as a word of ambiguous meaning, and points made by Wittgenstein on family resemblance concepts and the indeterminacy of language [REF].