Rational Animals: The Teleological Roots of Intentionality offers an original account of the intentionality of human mental states, such as beliefs and desires. The account of intentionality in Rational Animals is broadly biological in its basis, emphasizing the continuity between human intentionality and the levels of intentionality that should be attributed to animal actions and states. Rational Animals will be of interest to cognitive scientists, philosophers of mind, philosophers of biology, philosophers of action, ethologists, and those interested in the debates concerning animal intelligence.