Before i'd enter my brooding pen where I raised my call ducks i'd always make sure I had a can with cat food in it. I'd shake it and say "Peeper Peepers" As soon as I went in their brooder pen, I'd always sit down with them and hand feed them as well. I free range them now on 40+ acres and every time I have to put them away I yell out "Peepers!" And they always come flying at me and straight into their coop.