this was a few weeks that i was trying to find some worms to treat my 6 weeks old chicks. They always refused them leaving them on the ground of their chicken house. Yesterday i was again trying to find some when one of the roosters came next me, I found one and offered it to him. To my surprise it was quickly swallowed. I then thought to get more and bring them to the chicken house with that rooster so that the others see him eating worms and understand it is food. He ignored the worm yet they were all hungry. I then brought that rooster back where i was unearthing the worms and there he took more again. I don't know why, it might be the smell of freshly moved ground triggering something. So if your chickens refuse worms too, try bringing them with you when you garden.