Hi I have a few free range birds, two of them are polands. The problem is the keep getting diarrhoea. I have wormed them, that worked for a bit, then it comes back within a few days. If I keep them in a small cage with just pellets the diarrhoea stops too. It seems to be related to eating too many bugs but that's ridiculous, they are chickens. But when they go through the compost heap it gets worse. The problem is it is going to kill them eventually, they start drinking a lot of water first thing and then get sick, it happened to a bird I had before. I don't want to lose them, does anyone have any ideas?