The phenomenon of polyembryony in birds, extremely rare in natural conditions can be comparatively easily induced experimentally by cutting the blastodisk into 2 or more parts. In successful operations and optimal incubation conditions a whole embryo can develop from each physiologically isolated part. Considering experimental polyembryony from the viewpoint of the somatic embryogenesis theory, B. P. Tokin believes that "desintegration of normally correlated cell systems, tissues, organs and organism as a whole" is a necessary condition of the appearance of polyembryony in early stages of development. This work presents the results of experiments on obtaining experimental duck twins by means of physiological isolation of blastodisk portions during diapause.