Garden bird feeding is one of the most popular wildlife activities, but its welfare implications for bird populations are nuanced and increasingly studied by wildlife scientists.
Garden bird feeding occupies an unusual welfare position - a widespread human behavior with genuine capacity to improve wild bird welfare that also carries disease transmission risks if practiced poorly. Disease outbreaks at densely-visited feeders have caused significant mortality in finch populations affected by Trichomonosis and house sparrows affected by Salmonella. These welfare costs are preventable through regular feeder hygiene, appropriate food provision, and multiple feeder placement to reduce crowding. The welfare benefits of supplementary feeding during winter cold snaps appear substantial for energy-stressed birds. Overall, well-managed feeding is likely welfare-positive, but poorly managed feeding can cause net harm.