I trained my girls to come running when I call. Often I'll have kitchen scraps in the middle of the day and they aren't expecting them. So, I started by going our and getting their attention by calling in a high pitched shrill "....CHICK CHICK CHICK......CHICK CHICK CHICK...... at first they just looked at me from a distance but they soon learned that I had treats. Now If I go out any time of the day and want to see them I simply call out to them and they come running. I have always believed that chickens are individually dumb but collectively they are smart enough to survive and thrive.