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The article presents a study on the helminth fauna of Passer domesticus in the metropolitan region of Porto Alegre in southern Brazil. The researchers estimated the structure of its helminth community and then tested whether the season, age and sex of the host affect helminth composition and richness. They also gathered 160 sparrows using mist nets in 10 different sites in Porto Alegre, which is found in Rio Grande do Sul, Brazil. They concluded that knowledge on the ecology, behavior and environmental requirements of parasites and hosts are important for evaluating the role of landscape in determining the helminth fauna of a species.