The "Pantanos de Villa" wetland is a Wildlife Refuge (RVSPV), in Lima, Peru for many resident and migratory birds and is an important space for their development because it provides favorable spaces for their feeding and reproduction. Currently there is no delimitation for the breeding colonies of birds in the RVSPV Laguna Mayor, due to the lack of studies on nesting sites. Therefore, the objective was to evaluate the nesting sites and the reproductive behavior of three species of birds that nest in the Laguna Mayor. Monitoring was carried out once a week between the months of March and May 2022, and the nesting sites of three species were recorded: Nannnopterum brasilianum "Neotropical Cormorant", Chroicocephalus cirrocephalus "Gray-headed Gull" and Anas bahamensis "white-cheeked pintail", of which the microhabitat of the nest, the vegetation cover, characteristics of the eggs and chic...