I wish I could "overdo it" LOL. I have 4 chickens in my big coop, but I could probably add 6 more in it, but due to a mean chicken and her "helper" they'd kill anything else I put out there. What kinda ducks do you have?I have four chickens in the coop, six chicks in the house and two baby ducks in the house LOL, I kind of over did it