The grey heron is a familiar waterside bird whose welfare reflects the health of freshwater and estuarine ecosystems, and whose populations have remained relatively stable despite water quality challenges.
Grey heron welfare is closely tied to clean, productive waterways with accessible prey. Water pollution reducing fish populations and invertebrate communities affects foraging success. Severe winters cause starvation when all shallow water freezes. Heronries disturbed during nesting season cause colony abandonment. Waterway restoration benefits heron welfare alongside wider biodiversity.