Free: Contests & Raffles.
where else would the lead come from? Seems logical that decades of shooting leadshot into rivers, lakes and fields would be the source. Maybe I am missing something???
Those birds have high levels of more than just lead. Usually they have lead, cadmium and mercury. I don't know of bullets using cadmium, and doubt anyone is using rounds with mercury (especially for hunting--been illegal for a while). About the only place I can think of (sure someone on here might know of others) where the three seem to exist is smoke from coal plants. Maybe the birds like to fly in the smoke or something.