Waterfowl can be identified by using information about size, shape, color pattern, markings, behavior, habitat, range and calls. All clues are important, but by far the most important things to concentrate on for this group are shape and color pattern. And of the color patterns, the most important is to look for the white. Dabbling & Diving Ducks is the second guide of a three-part series that addresses a unique identification system developed by the Cornell Lab of Ornithology.