Streptococcal infections in poultry, although not common, occur worldwide (1). Peckham (4), reviewing published literature on these diseases, stated that fewer than two dozen papers had been written from the time of the first, by Nogaard and Mohler in 1902 (3), to 1966, the date of his own report. The species most commonly responsible for outbreaks of streptococcosis in domestic birds are Streptococcus zooepidemicus and S. faecalis (1,4), which respectively belong to Lancefield's groups C and D. S. faecalis is extremely common in the intestinal contents of mammals and birds, becoming a pathogen only under unusual circumstances (letter dated 17 February 1978 from W. B. Gross, Virginia Polytechnic Institute and State University, Blacksburg, Virginia). Isolates of S. faecium (S. durans Sherman and Wing, 1937) injected intravenously into chickens have induced endocarditis (1), but there are no published records of natural infections. This paper reports an outbreak of S. zooepidemicus infection in the eared grebe (Podiceps nigricollis). It appears to be the first record of epizootic streptococcosis in any wild avian species.