Criteria of Age of Incubated Mallard, Wood Duck, and Bob-White Quail Eggs

Abstract

Descriptions of a portable egg candler, an egg volumeter, and the technique of photographing incubated eggs with transmitted light have been presented elsewhere (Hanson, 1954, Journ. Wildl. Mgt., 18: in press). This report, primarily a continuation of the above report, presents photographs and notes on the developmental stages of three species: the Mallard (Anas platyrhynchos), Wood Duck (Aix sponsa), and Bob-white Quail (Colinus virginianus). These photographs should also be useful in determining the stage of development of eggs of other species whose incubation periods are similar. Photographs