Based on the motifs of M. Bulhakow's story with the same title. The thing about the scientist-zoologist Persikow, whose unique invention makes the rate of formation and development of organisms grow thousands of times. The experiment subjects eggs of the anaconda, which by mistake go to the mad director of the model chicken farm, dealing with rebuilding the hen population in the country. Irradiated reptiles, hatching from eggs, start to devour.