Ducks

Storey's Illustrated Guide to Poultry Breeds: Chickens, Ducks, Geese, Turkeys, Emus, Guinea Fowl, Ostriches, Partridges, Peafowl, Pheasants, Quails, Swans – Storey Publishing. View on Amazon
Duck (Animal series) – Used Book in Good Condition. View on Amazon
Waterfowl: A Field Guide to Native North American Species (Wildlife and Nature Identification) – Used Book in Good Condition. View on Amazon