Deer species kept in captive settings from zoo exhibits to enclosed deer parks have welfare requirements shaped by their natural behaviour; fear of humans and flight distances are key welfare determinants.
Captive deer welfare is complicated by their status as prey animals: they are highly reactive to perceived threats including unfamiliar humans, and environments that allow frequent close approach create chronic low-level fear states. Well-designed deer management in parks and zoos uses appropriate fencing, minimal-approach management zones, and habituation protocols that reduce the frequency and intensity of flight responses. Antler removal — where practiced — should always include appropriate analgesia.