My chickens may not be as "tame" as some peoples, but they do know that people are the source of treats. Most days they get some sort of treat- sometimes just food scraps or stale bread. They come running anytime we open the back door. The problem is that the past few days they have come running when we open the driveway gate to put our cars away. I'm afraid they're going to get run over. Of course my response was to have my son feed them some sunflower seeds away from the driveway, which only reinforces their behavior