The scenario is - I have 3 chickens and 1 pekin duck. The duck was raised with the chickens and thinks she is one. The 4 of them travel all over the yard together. I'm getting ready to build a coop. Right now they are in chicken tractors. Last year all 4 of them were together in 1 but now the duck is too big and she's in a separate tractor but always beside the chickens. Here are the questions. I will have an additional 5 chickens soon. The coop will be 12X10. I was thinking.... should I put a drain in it for a winter 'bath' tub for Duck-Duck? Has anyone done that? I was going to use sand in the coop for floor litter. Should I separate out the duck altogether because of the sand or will the sand not bother the duck? I had in mind to put a floor drain in one section and during the winter it would be easy to have a small rubber tub sitting over it that I could just tilt it and drain it out to the ground. But will that cause water rot under the coop. I don't think it will be more than 5 inches off the ground. Just trying to think the best design to put a duck in with the chickens. Any thoughts? Thanks in advance!