The mute swan is a species of swan and a member of the waterfowl family Anatidae. Mute swans can be very aggressive and are highly protective of their mate and offspring. Most defensive acts from a mute swan begin with a loud hiss and, if this is not sufficient to drive off the predator or intruder, are followed by a physical attack. Swans attack by striking with their wings, accompanied by biting. Aggressive, mean and thinks very highly of itself.