Siliserh lake is one of the most significant and productive environments for birds, as it provides various requirements for their survival is, located in the Aravalli hills in the district of Alwar, Rajasthan. The study conducted from January 2021 to February 2023. During the post-monsoon season, 60 species from 15 families were recorded, while the pre-monsoon season observed 37 species from 14 families. The study area supports a diverse range of waterbird species, including resident, local migratory, and winter visitors with 48.33%, 16.67%, and 35%, respectively. The aquatic avian species in this lake face threats due to various anthropogenic activities, including encroachment for agriculture and urban construction, waste dumping, catchment degradation, drainage for agriculture, and recreational activities at the wetland site. These activities pose significant challenges to the conservation of the lake’s avian biodiversity. Worldwide, 12% of all avian species are threatened with global extinction. Wetlands are very important for the conservation of waterbirds, as 20% of the population of threatened bird species from Asia inhabits wetlands