Ever since cognitive psychologists discovered 'essentialism' as a research topic there has been a debate between those who argue for a revival of classical categories for such things as living kinds, and those who argue for an earlier revolution in thinking which is tied to probabilistic featural models with prototype effects. New evidence argues that species categories are indeed classical categories with necessary and sufficient conditions of membership (namely, reproduction of kind, and mating with kind), despite their demonstrable prototype effects, which are due to processes involved in token identification procedures rather than category representation.