Grouse Guy, why didn't you say to put lead shot in a one acre lot confine the birds in a flight pen.adjust the lead or the amount of birds and look at the results. it would be more accurate then putting lead in tweetys feed bowl. you also use the word MAY in all your descriptions of what WILL happen.a lot of studies use excessive amount in there analysis i.e. if you eat one ton of alfalfa a day your hair will grow back. m.c.