Birds in zoos range from small songbirds to large ratites, with welfare challenges including prevention of natural flight, inadequate space for territorial species, and the psychological impact of limited movement.
The inability to fly freely represents a fundamental behavioral deprivation for most captive birds, particularly species adapted for long-distance movement. Pinioning - amputation of the outer wing joint - prevents flight permanently and constitutes a major surgical intervention performed to solve a management problem at the cost of irreversible physical modification. Birds in small enclosures cannot express natural flight, territorial, or foraging behaviors, leading to stereotype development. Large walk-through aviaries represent a genuine improvement but cannot provide the scale of movement that wild birds achieve daily. The welfare of captive birds is highly variable across facilities, with the most welfare-positive environments providing large, complex aviaries with appropriate social groupings and species-specific enrichment.