My flock free ranges and the creek behind the house is full of minnows and crawdads and other tasty snacks. I did not teach them either. About 5 summers ago the creek ran almost completely dry and left untold amounts of dead and dying minnows for a few days. My old game hen was raising her first group of many chicks and she found them. From then on she has taught her chicks and the rest of the flock to fish. Before you try to have them fish them out themselves, toss a few smaller live ones in their direction. One brave one will snag it and then the chase is on and you may want to not watch the tug of war that could and probably will ensue. After that, shallow pan and live minnows and sit back and enjoy.