I have a crested duck for the first time and boy is she loud. She scream quacks constantly. All the others only do so when they think I have Mealworms or are coming to murder them. They have quiet quacks around the water bowl. I call this the Coffee clatch quack. The medium quack for we've been released from the coop and only scream quack when they are frightened or very excited. She scream quacks through everything. Is this a crested thing? Could she be hearing impaired? It used to scare the others but they seem to have accepted her idiosyncrasies. Hope they don't every make her lookout duck.