dark green droppings = holding corn = regurgitating corn = young bird sickness starve 24 hours add a hand full of garden lime to water , ensure you clean all loft up of any spoilt grain = use loft whitener to absorb wet droppings = charcoal tablet birds leave for two hours = feed dupurative with Cinnamon and live natural yoghurt and garden lime and juice of one lemon and a small amount of ground nut oil for 3 days , 2nd day ensure non are holding corn charcoal tablet again , feed on depurative when your sure there digestive systems are working you can soak some green peas in hot water and feed these for two days then revert back to your normal mix . clay pickstones are also good at neutralising the birds digestive systems . Hope this helps