I had two three month old ducks but one passed away a few days ago. They were very bonded to each other and not to me or my roommate. I just finished my outdoor coop for them, but now since the duck is all alone, I feel like I should introduce one or two other birds. I wanted to add a chicken or two since I read that their scratching of the dirt would help compost the dirt run of the coop. I'm not sure how I should go about introducing them though. I don't have the space to keep them in pens next to each other. Should I buy chicks that are a week or two old and let them be with the duck during the day until they can tolerate the code and live outside in the coop? Do they need to be that young to bond well to the duck or can I get one a little older? Will the two birds even be able to bond to each other?