 Since Aristotle, species have been paradigmatic examples of natural kinds with essences. An essentialist approach to species makes sense in a pre Darwinian context. God created species and an eternal essence for each species. After God’s initial creation, each species is a static, not an evolving group of organisms. Darwinism offers a different view of species. Species are the result of speciation. No qualitative feature—morphological, genetic, or behavioral—is considered essential for membership in a species. Despite this change in biological thinking, many philosophers still believe that species are natural kinds with essences. Let us start with a brief introduction to kind essentialism and then turn to the biological reasons why species fail to have essences.