The aerobic fecal flora of wintering Brent Goos (Branta bernicla), Barnacle Goose (Branta leucopsis), Greylag Goose (Anser anser), White-fronted Goose (Anser albifrons), Pink-footed Goose (Anser brachyrhynchus), and Bean Goose (Anser fabalis) was studied. There were no specific differences between the various geese. Bacterial counts were in the range of 10(5)-10(7) CPU per gram of feces. Neither pathogenic bacteria nor rotavirus could be detected in the fecal samples of the wintering geese, so that a contamination of the environment with those pathogenic organisms could be excluded. The majority of the isolated bacteria belonged to the genera Bacillus and Pseudomonas; enterobacteria and streptococci were less common. The observations are discussed regarding their epidemiological and ecological significance.