The wetlands of Callao have a variety of aquatic flora and fauna. These oases (Ventanilla Wetlands Regional Conservation Area (ACRHV), El Mirador Municipal Ecological Park and the Poza de la Arenilla-HCPA Coastal Wetland) are a great attraction for tourism and bird watching. However, there is only one wetland with protection status: Ventanilla Wetlands Regional Conservation Area (ACRHV). Although the other two wetlands are not protected, there are initiatives for their conservation. The importance of this article lies in identifying the bird species that these wetlands harbor, as well as having accurate information on the resident and migratory birdlife. The Jaccard similarity index was calculated to 1) determine the similarity in species composition between the three wetlands: ACRHV, El Mirador and HCPA, and 2) determine the similarity between the same seasonality categories for ACRHV +...