I'm not an ornithologist, but have been trained by some of them. I
don't think there is much natural about disease spread in this way and
foraging in the wild would not carry the same sort of risk in spite of
any species vulnerability to soil born pathogens.
Folks who feed the birds should take care not to provide unhygienic
hospitality. It may not be natural, but like a number of other things,
feeding the birds it is more fun when you keep it clean.
Bill Kahn
Minneapolis
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