Among the numerous criticisms of sociobiology is the criticism that it is not genuine science. This paper defends sociobiology against this criticism. There are three aspects to the defense. First, it is argued that the testability criterion of pseudoscience is generally problematic as a criterion and that even if accepted it fails to mark sociobiology as a pseudoscience. Second, it is argued that Thagard's more comprehensive and sophisticated criterion of pseudoscience fails to mark sociobiology as a pseudoscience. Third, a positive case for accepting sociobiology as genuine science is presented.