Garden bird feeding is practiced by millions of people globally, providing welfare benefits for some species while introducing potential disease and ecological risks.
Bird feeding is one of the most widespread wildlife welfare activities practiced by private individuals, and evidence suggests it delivers real welfare benefits particularly in winter when natural food is scarce. However, dirty feeders create disease risk that can outweigh the nutritional benefit — feeders that are not cleaned regularly become vectors for bacterial and parasitic disease that spreads rapidly in birds gathering to feed. The types of food provided also matter: high-energy, appropriate-species foods are more beneficial than mixed seed bags that leave nutritionally poor components to moulder. Responsible feeding means cleaning equipment regularly, providing appropriate foods, and monitoring for signs of sick birds that may indicate a disease cluster.