Bird feeding in gardens and public spaces is one of the most popular forms of human-wildlife interaction globally. Understanding the genuine welfare benefits and potential risks helps people feed birds in ways that maximise positive impact.
Wild bird feeding provides genuine welfare benefits — supplementary nutrition during food-scarce periods, particularly in cold winters and dry summers — but these benefits depend critically on how feeding is done. Dirty feeders concentrate birds around disease reservoirs that can cause population-level mortality events; greenfinch populations declined significantly in parts of Europe due to trichomonosis spread at communal feeders. Appropriate food matters: bread fills birds with calorie-dense but nutritionally poor material, impairing foraging for more complete nutrition. Window collisions are partially preventable through feeder placement — the window proximity paradox means that feeders very close to windows (within 1 m) produce slower approach speeds and more glancing impacts, while feeders far from windows (3+ m) allow birds to perceive glass danger better. Cat predation near feeders is a welfare issue that feeder placement (away from cover) can partially mitigate.