I have a paper at home written by an Ak fish and game biologist friend of mine that addresses this issue in detail. Ducks eat lead shot and grind it up in their gizzards and it eventually trashes their livers and kills them. It's my impression that shot ingested into a stomach is not broken down much by stomach acid before being passed out. It is however most definitely an issue when ground up in a gizzard. I'm sure I can get a link to that article from Dan and post it here at some point. I can't remember if the lead levels were elevated in the duck tissues. Have to wait until I find that article in my files.
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