According to Yoon, the cladists would say that once you accept this—that many of the fishy-looking creatures swimming in the water are more closely related to mammals than to each other—you begin to see a strange truth unfolding before your eyes. That “fish” as a sound evolutionary category is totally bunk. It would be like saying, as Yoon puts it, “all the animals with red spots on them” are in the same category, “or all the mammals that are loud.” Fine, it’s a category you can make. But it’s scientifically meaningless. It tells you nothing about evolutionary relationships.
