This sourcebook explores how the Middle Ages dealt with questions related to the mental life of creatures great and small. It makes accessible a wide range of key Latin texts from the fourth to the fourteenth century in fresh English translations. Specialists and non-specialists alike will find many surprising insights in this comprehensive collection of sources on the medieval philosophy of animal minds.

Introduction: Animal Minds In Medieval and Modern Philosophy.- Part I - Cognition.- Chapter 1. Perception, Knowledge, and Reason (Augustine, De quantitate animae 25-28).- Chapter 2. Souls and Discrimination (Adelard of Bath, Quaestiones naturales 13-14).- Chapter 3. Estimation and Concept Formation (John Blund, Tractatus de anima 19).- Chapter 4. (a). Memory, Learning, and Prudence (Albert the Great, Metaphysica I.1.6).- (b). Reasoning, Learning, and Language (Albert the Great, De animalibus XXI.1.2-4). Chapter 5. Universal Cognition (Pseudo-Peter of Spain, Commentum super libros De animalibus VIII).- Chapter 6. (a). Reasoning and Thinking (Roger Bacon, Perspectiva II.3.9).- (b). Goal-Directed Behaviour (Roger Bacon, Questiones super libros IV Physicorum II).- Chapter 7. Inner Senses (Thomas Aquinas, Summa theologiae I.78.4).- Chapter 8. Prudence (John Duns Scotus, Quaestiones super libros Metaphysicorum Aristotelis I.3).- Chapter 9. Judging and Erring (Gregory of Rimini, Lectura super I Sententiarum III.1 vs.Adam Wodeham, Lectura secunda in I Sententiarum, prol. 4.8).- Part II. Emotion.- Chapter 10. Friendship, Enmity, and Fear (Albert the Great, Quaestiones super De animalibus VIII.1-3).- Chapter 11. (a). Lust and Anger (Thomas Aquinas, Summa theologiae I.81.2-3).- (b). Enjoyment (Thomas Aquinas, Summa theologiae I-II.11.2).- (c). Hope (Thomas Aquinas, Summa theologiae I-II.40.3).- Chapter 12. Happiness and Fun (Peter of Abano, Expositio problematum Aristotelis 28.7).- Part III. Volition.- Chapter 13. Judging and Free Choice (Albert the Great, De homine I).- Chapter 14. Free Will (Bonaventure, Commentarius in secundum librum Sententiarum 25.1.1).- Chapter 15. Instinct and Deliberation (Roger Bacon, Communia naturalium I.2.4.1).- Chapter 16. (a). Free Choice (Thomas Aquinas, Quaestiones disputatae de veritate 24.2).- (b). Choosing and Acting (Thomas Aquinas, Summa theologiae I-II.13.1-2).