Chilika Lake is the largest wintering ground for migratory birds, on the Indian sub-continent. It is one of the hotspots of biodiversity in the country. Some species listed in the IUCN Red List of threatened animals inhabit the lake for at least part of their life cycle.

White bellied sea eagles, greylag geese, purple moorhen, jacana, flamingos, egrets, gray and purple herons, भारतn roller, storks, white ibis, spoonbills, brahminy ducks, shovellers, pintails, and more.

Migratory water fowl arrive here from as far as the Caspian Sea, Baikal Lake and remote parts of Russia, Mongolia, Lakah, Siberia, Iran, Iraq, Afghanistan and from the Himalayas. A census conducted in the winter of 1997-98 recorded about 2 million birds in the lake.

In 2007, nearly 840,000 birds visited the lake, out of which 198,000 were spotted in Nalbana Island. On 5 Jan 2008, a bird census involving 85 wildlife officials counted 900,000 birds of which 450,000 were sighted in Nalabana. Removal of invasive species of freshwater aquatic plants, especially water hyacinth, due to restoration of salinity, is a contributing factor for the recent increasing attraction of birds to the lake.


Nalbana Island is the core area of the Ramsar designated wetlands of Chilika Lake. Nalbana means "a weed covered island" In the Odia language. It is a major island in the center of the lake and has an area of . The island gets completely submerged during the monsoon season. As the monsoon recedes in the winter, lake levels decrease and the island is gradually exposed, birds flock to the island in large numbers to feed on its extensive mudflats. Nalbana was notified in 1987 and declared a bird sanctuary in 1973 under the Wildlife Protection Act.

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