I wondered the same thing. I read somewhere some time back that the issue was mostly shotgun shot where it gets scattered in the shallow marshes where the birds forage and they ingest it that way. I too am having a hard time imagining how the birds come in contact with lead fishing sinkers. Not that I know all uses for sinkers but when I use them it is usually around fairly deep water where if I lost one I don't see how a bird would come in contact with it. And if you stretch the thought to include jig heads well with a hook attached I can't imagine a bird ingesting although the hook with rust away over time. That is why I don't believe that there is credible data to back the claim that fishing lead is truly a threat to water birds...
kc




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