I have a very young mallard duckling, she is probably a week old now. The thing is, I had to separate her because she is mercilessly attacking her siblings. I tried to put her with older ducks and she tried doing it with them too but they got her back. So now she is in by herself with a stuffed animal giraffe (which she adores and never strays far from). She lowers her head and hisses and even attacks hands and fingers, which is fine because she's still little to do any damage anyway. How can I help her out to not be so aggressive? I don't need an attack mallard on my porch when she grows up.