I think 4+ yr old public land birds anywhere. The one's that may give you a courtesy gobble to clear his morning throat then shut up the remainder of the day. The ones I like to call a "hermit". His heart is so shriveled up into a piece of coal, sweet hen music doesn't even pique his interest except around 2pm every other Thursday. I have fooled with at least 2 like this in my life. Never killed either one of them. I don't think Ray Eye could have killed either one of these birds unless he shot him off the roost, which I thought about trying on several occasions.