australian black swan cygnusatratus

algae animal aqu aquat aquatic aquatidae australia australian autralia beak bird black breeding cob cyg cygnets cygnus cygnusa cygnusatratus diet duck ducks exclusively family female fish fly flyers forty genus goose grass green herbi herbivoos herbivoous herbivorous herbivous highly indi indigenous largely lawn life male mallard marshland meadow monogamous monogomous month months moults nature nine nomadic parents pen plant plants pond span species strong swan tended waterbird waterfowl wildlife wing years zoo