I have the Grandpa feeder. Have used it on and off for 5 years now. Wish I just left it when I first had my chickens using it - was great. Now I need to be using it again due to rats (of course). I have 2 original 5 year olds that know how to use it. "they say" the other chickens will watch and learn. So how long does that take? I have 3 others (2 hens, 1 rooster) that do not understand. I will say its only been 2 days I just feel bad when I go in there and my Weezie stares at me like, "wheres my food?" I see the older ones stepping on the treadle and eating, and she might go and grab the food but they are bullies towards her. I push the treadle for her to show her, she steps on it and eats but then she steps away and doesn't understand.