What is a species?

The Logic of Science

Alligator snapping turtle (Macrochelys temminckii)

Before you read any further, I want you to take a minute and try to answer the question in the title. Go ahead and write down (or at least think about) the definition that scientists use to determine whether or not two organisms are members of the same species. Now that you have hopefully done that, I am going to burst you’re bubble and tell you that if you wrote down a definition, then no matter what definition you wrote, you’re wrong, or at the very least, incomplete. You see, there is no one universally agreed upon definition of a species. Rather, there are numerous “species concepts” and scientists debate endlessly about what constitutes a species. Further, taxonomic revisions happen constantly and it is extremely common for one “species” to get split up into multiple “species” while other “species” get lumped together into a single…

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