As part of the ongoing Bird Atlas programme, a coordinated post-monsoon bird survey was conducted across the Puducherry region from 25 to 28 December. The primary objective was to document the seasonal diversity and distribution of birds across major habitat types during the post-monsoon period, when resident species and winter migrants are present together in large numbers. The survey saw enthusiastic participation from more than 40 birdwatchers and citizen scientists from Puducherry, Tamil Nadu, Kerala, and Karnataka, reflecting strong regional collaboration and collective learning in biodiversity monitoring. The study region was divided into predefined atlas grids, and four transects were surveyed within each grid. Each transect was observed for a minimum of 15 minutes following standardized protocols to ensure uniform sampling effort. Surveys covered diverse habitats such as open water bodies, wetland margins, mudflats, agricultural fields, scrublands, tree-dominated areas, and human-modified landscapes. This systematic grid- and transect-based approach enabled representative sampling of both aquatic and terrestrial bird communities across the region. Over four days, the survey generated more than 317 complete checklists, creating a rich, high-resolution dataset for spatial and seasonal analysis. A total of 207 bird species were recorded, highlighting the remarkable bird richness of Puducherry during the post-monsoon season. The species documented represented multiple feeding and habitat guilds, offering valuable ecological insights. Terrestrial insectivores such as warblers, flycatchers, prinias, and drongos formed the largest group, indicating healthy scrub and tree cover. Waders and shorebirds including sandpipers, lapwings, snipes, and jacanas reflected the presence of shallow wetlands and mudflats, while strong representation of piscivores such as pelicans, cormorants, darters, and kingfishers suggested productive aquatic ecosystems. Waterfowl including whistling-ducks, pintails, geese, and spot-billed ducks reinforced the importance of the region as a seasonal refuge for winter migrants. The simultaneous presence of residents, local migrants, and long-distance migratory species demonstrates the ecological connectivity of the Puducherry landscape within broader migratory pathways along India’s east coast. The survey findings underscore the importance of wetland–terrestrial habitat mosaics in sustaining functionally diverse bird communities. In conclusion, the post-monsoon Bird Atlas survey establishes a strong seasonal baseline for understanding avian distribution in Puducherry. The high species richness and guild diversity reaffirm the value of coordinated citizen science efforts and emphasize the need to conserve heterogeneous habitats across the region. The dataset generated will directly support long-term Bird Atlas outcomes and contribute to evidence-based conservation planning.