You should be able to spot painted storks, spoon billed storks, pelicans, ibis, crocodiles, kingfisher, egret, heron among many others. The govt. has arranged for boat tours within the islets for a nominal charge. We went on one such boat ride post lunch. The boat ride gives an amazing chance to be up, close, and personal with all the feathery-friends. You can spot nesting of the storks and pelicans as well. And boy we were lucky to even spot a crocodile taking a tour of the island. Apparently, the crocodiles were introduced to the Cauvery river to thwart off enemies by the then Mysore kingdom (not sure of the authenticity of this part).