Hello, I am new to raising poultry, and would love some help. We (my husband and I) are in the process of building a coop for our chickens and ducks (3 Bantams, 1 red star (I think), and 2 Pekings), and I am trying to figure out how big the coop door will need to be for the ducks (as I'm assuming they will be the largest birds in there). Any other tips on raising chickens and ducks together would also be appreciated! Thanks!