Cyclones Nivar and Burevi have brought relief to migratory birds in parched Tamil Nadu More action is needed to conserve bird habitats, which desperately need rain-filled storms to enable their prey to thrive, suggest experts. Spot-billed pelican nesting sighted at the Pallikaranai marshland. | KVRK Thirunaranan. Cyclones Nivar and Burevi brought relief to migratory birds after a two-year lull post-cyclone Gaja in the southern Indian state of Tamil Nadu, which was finally able to clock a good count of the winged visitors in the 15 wildlife and bird sanctuaries, even as avian experts warn that research, conservation and monitoring of bird habitats in the state leaves a lot to be desired.