We have a few kcampbells, an Indian Runner and the little black one - all of them love slugs, all colours and sizes. I even gave them the giant tiger slugs we occasionally find under the sink (how to they get in I wonder?) and the large black kind. Once (I wish I had filmed it) the Indian Runner shot off with it in her bill, the slime dripping and all the others ran after her, trying to get a piece of the delicacy (yuk). She doesn't have her name for nothing, no contest! I read somewhere that the green slugs are poisonous for our native birds as they came from America.I can't stop the ducks from having them and do hope that it will do them no harm. I am not sure if they are actually green or if the beige variety we have in the garden is what was talked about then.