Chapter 1. Introduction -- Chapter 2. Physiology and Functional Anatomy -- Chapter 3. Sensory Systems -- Chapter 4. Biology of Stress -- Chapter 5. Normal Behaviour -- Chapter 6. Social Behaviour as a Challenge for Welfare -- Chapter 7. Brains, Behaviour, and Cognition: Multiple Misconceptions -- Chapter 8. Psychological and Behavioural Principles and Problems -- Chapter 9. Effects of Ontogeny, Rearing Conditions, and Individual Differences on Behaviour: Welfare, Conservation, and Invasive Species Implications -- Chapter 10. Controlled Deprivation and Enrichment -- Chapter 11. Effects of Noise and Light -- Chapter 12. Ethologically Informed Design and DEEP Ethology in Theory and Practice -- Chapter 13. Spatial and Thermal Factors -- Chapter 14. Nutritional Considerations -- Chapter 15. Naturalistic Versus Unnaturalistic Environments -- Chapter 16. Evidential Thresholds for Species Suitability in Captivity -- Chapter 17. Record Keeping as an Aid to Captive Care -- Chapter 18. Arbitrary Husbandry Practices and Misconceptions -- Chapter 19. Miscellaneous Factors.