Wild Bird Feeding: Benefits, Risks, and Best Practices

Feeding wild birds is one of the most widespread forms of human-wildlife interaction. Done well, it benefits birds; done poorly, it can spread disease and disrupt ecology.

Key Facts

An estimated 55 million people in the US feed wild birds, spending over $5 billion annually
Supplemental feeding helps birds survive cold winters when natural food is scarce
Poorly maintained feeders spread diseases including salmonellosis, aspergillosis, and trichomoniasis
Window strikes kill up to 1 billion birds per year in North America — feeders increase strike risk
Non-native plants and invasive species introduced near feeders can alter local ecology
Seed mixes with milo and other fillers attract fewer species and produce more waste
Clean feeders and native plant gardens together provide more welfare benefit than feeders alone

Welfare Considerations

Bird feeding has a complex welfare calculus. At its best, supplemental feeding helps wild birds survive extreme weather, especially in urbanized landscapes where natural food sources are reduced. At its worst, poorly maintained feeders concentrate birds, spreading respiratory and gastrointestinal diseases. Feeders placed near windows create lethal collision risks. The welfare benefits of bird feeding are maximized when feeders are cleaned regularly, placed away from windows with appropriate markers, stocked with high-quality species-appropriate food, and complemented by native plant gardens that provide year-round natural food sources. Responsible feeders also reduce outdoor cat exposure near feeding areas.

What You Can Do

Clean feeders every 1-2 weeks with a 10% bleach solution
Place feeders within 1 meter of windows (too close for speed) or over 10 meters away
Use high-quality seed mixes without cheap filler grains like milo
Plant native species to provide natural food alongside supplemental feeding
Keep cats indoors, especially during dawn and dusk when birds are most active