Rangnaithittu bird sanctuary is very close to Bangalore- about an hour's drive. Located on the bank of the Cauvery river, it is a small, but lovely sanctuary. Boats are available on hire to take a round of the beautiful lake in the heart of the sanctuary and see crocodiles and birds from close quarters. When I visited the sanctuary recently, there were not many birds, but the trip was still very enjoyable. Would love to visit the sanctuary again, maybe in February or March when there would be more birds around.