Ranganathittu Bird Sanctuary

About Ranganathittu Bird Sanctuary

A protected bird sanctuary on islets of the Cauvery river near Srirangapatna, established 1940 on the recommendation of ornithologist Dr. Salim Ali. One of Karnataka's most important bird breeding sites. The islets themselves are older than the sanctuary status suggests: they were formed in the 1640s when Kanteerava Narasimharaja Wadiyar, then ruler of Mysore, built a raised stone wall across the Kaveri, backing up water and leaving a scatter of rocky islands where the current now runs shallow. Those islands went unprotected for three centuries until ornithologist Dr. Salim Ali surveyed the birdlife here in 1939-40 and personally persuaded the Maharaja of Mysore to declare it a sanctuary the following year, a piece of advocacy still credited today for saving one of South India's most important heronries before large-scale habitat loss could reach it.

About the Place

Home to painted storks, herons, egrets, cormorants, ibis, spoonbills, and other migratory/resident water birds; also mugger crocodiles bask on the rocks along the river. Boat rides through the sanctuary are the main way to view birds and nesting colonies, especially during breeding season (June to November). More than 221 bird species have now been recorded across the sanctuary's islets, a figure that keeps growing as researchers track both resident breeders and the migratory visitors that pass through outside the main nesting months.

Places to Visit near: Srirangapatna Fort; Kunti Betta. How to reach: Bus/Train to Srirangapatna then a short local transport ride (~3 km) to the sanctuary. Bike/Car via the Bangalore-Mysore highway.

Salim Ali's intervention in 1939-40 is often cited as one of the earliest successful examples of a naturalist directly influencing Indian conservation policy, well before independence and decades before formal wildlife protection legislation existed in the country. His survey work and subsequent advocacy with the Wodeyar administration set a template that other conservationists would later point to when pushing for similar protections elsewhere in India, making Ranganathittu historically significant well beyond its immediate ecological value.

The islets themselves function almost like a natural amphitheatre for birdwatching: because Kanteerava Narasimharaja Wadiyar's 17th-century stone barrage backed up the Cauvery just enough to strand a cluster of rocky outcrops rather than submerge them entirely, the birds nest close to the water's edge on structures too small and awkward for most land predators to reach easily, which is part of why the colonies here have persisted so successfully for centuries.

Breeding season (June to November) coincides with the monsoon and post-monsoon period, when water levels rise enough to isolate the islets more completely from the riverbank, offering the nesting birds extra protection from land-based predators during their most vulnerable weeks. Visitors arriving outside this window will still see resident birds and the sanctuary's crocodiles, but the dense, crowded nesting-tree spectacle that Ranganathittu is best known for is very much a seasonal phenomenon rather than a year-round guarantee.