This Study was conducted from May 2020 to April 2022 at an urban park name Ecopark, located in Kolkata. A total of 116 nests of 38 birds were observed in this study area. Out of these 116 bird nests, 82 bird nests were found to have well developed young, while the other 34 were discovered to be unsuccess due to various reasons. Common Mynas (11) nests were found most. 8 types of nesting structures were observed during this survey namely Deep cup nest, Shallow cup nest, Hole nest, Platform nest, Dome shaped nest, Flat shaped nest, Hanging nest and pear-shaped nest. Hole nest (11) was the most visible nest in this study. Birds were seen nesting lowest on the surface of the water 0 ft to highest over 40 ft height. Storms, heavy rains, human activities, birds of prey, monitor lizards, snakes, rats, ants were indicated as the nests, chicks and birds egg damager.