Fecal samples from 1,244 birds representing seven orders, 19 families, and 43 species were examined for patent schistosome infections in lower Michigan during the summers of 1977-1978. An infection rate of 13.6% was found in all birds examined. Whereas after hatching-year anseriforms had an infection rate of 12.0%, hatching-year anseriforms had a much higher rate (46.3%). Following the first hatching-year infection (June 21), 57.1% of the hatching-year birds were infected. Infections in all other birds examined were limited to the families Corvidae (1.6%), Mimidae (3.3%), and Paridae (2.5%). Differences in infection rates between hatching-year and after hatching-year passeriforms were insignificant. No patent infections were found in hatching-year passeriforms prior to July 14. The infections in the blue jay (Cyanocitta cristata), gray catbird (Dumetella carolinensis), and the tufted titmouse (Parus bicolor), represent new host records for Gigantobilharzia.