The document discusses kingfishers found in the Sundarbans, the world's largest delta located in India and Bangladesh. It provides details on 12 different kingfisher species found in the region, including the Common Kingfisher, Blue-eared Kingfisher, Oriental-Dwarf Kingfisher, and Brown-winged Kingfisher. For each species, it describes their physical characteristics, habitat, seasonal presence, geographic distribution in India, and IUCN conservation status. The document aims to educate readers about the biodiversity of kingfishers living in the Sundarbans delta ecosystem.