Remember poison birdfood?
https://www.theguardian.com/sc...
With the avian flu endemic through many states commercial poultry producers... feeding those wild birds could well spread this problem a lot further... One sick bird visits feeder and every bird in the neighborhood is subject to getting sick... They don't wear masks... Nobody is working on a vaccine for this...
Feeding these birds... makes them a lot easier for predators to catch...
Obvious solution... Create wildlife garden where birds can eat fruit and seeds from the plants... as God designed.
