There are two varieties of Call ducks, the Gray and the White. They are bantams in the duck family, and are bred for smallness of size. They should have short legs, an upright, almost horizontal carriage of body, slender neck, and comparatively short, well rounded body.
Reference:
All Breeds of Poultry, Origin: History: Description, Mating
and Characteristics, by Frank L. Platt. Published by AMERICAN POULTRY JOURNAL,
Chicago, Illinois.
D. Schlehuber, California