They come in herds and prey on the fish in the fish farms in a flash. The moment the cormorants are spotted above any fish farm, the care takers try to scare them off with these hoooi…hoooi calls. During the fish hatching season, the whole Kadamakkudy reverberates with these hooi calls. Some use crackers to ward them off…Hundreds of them land very quickly and start consuming fish. Here is one such herd of birds…Collectively they make a humming sound while diving deep and coming up rhythmically.