Modern zoo welfare science focuses on positive welfare states — not just preventing suffering, but enabling animals to experience positive emotions and flourishing.
Positive welfare science represents a significant advance over the traditional disease-prevention model of animal care. An animal that is not sick, not in pain, and not fearful might still be profoundly bored, frustrated, or leading an impoverished life. Positive welfare frameworks ask what animals need to actively thrive — what situations produce genuine positive emotional states. Play, exploration, social bonding, reproductive success, and voluntary engagement with enrichment are all measurable positive indicators. Zoos that shift their evaluation from "are problems absent?" to "are positive states present?" create richer, more meaningful lives for the animals in their care.