ocr: KNOBBED SWANS BASE TO BEAK OMETIMES WEIGHING more than 30 pounds O(13.6 kg), swans are among the world's heaviest flying birds. There are eight species, and all are good swimmers with large, webbed feet. Swans feed by using their long neck to reach submerged plants. In deep ALL-WHITE water, a swan will upend to PLUMAGE reach the bottom. Swans are found mainly in cool parts of the northern hemisphere. MUTE SWAN - BLACKLEGS - - L - - are Male both and white. female Their mi ute yound, STPBTS - AND FEET - - - called cygne ets, aregray-brown. KEY FACTS
