Garden bird feeding is practiced by hundreds of millions of people globally and can provide meaningful welfare benefits to wild birds, but inappropriate feeding carries risks of disease transmission, nutritional harm, and behavioral dependency.
Bird feeding is a welfare positive when done correctly and a welfare negative when done poorly. The welfare benefits of supplementary feeding during harsh conditions are well-documented — small birds can die within hours of energy depletion in winter cold. However, unsanitary feeders spread disease through congregated bird populations at rates that would not occur naturally. Inappropriate food causes nutritional deficiencies. Feeders placed at intermediate distances from windows cause massive window strike mortality. The solution is not to stop feeding but to feed responsibly: use appropriate species-specific foods, clean feeders weekly with hot water and disinfectant, rotate feeder locations to prevent ground soiling, and position feeders correctly relative to windows.