What are some of the diseases they can get(Show some pics so I can know what it looks like)? How can I prevent it? What is the BEST things for them to eat? What will they die from if they eat it(Food-wise)? What is the BEST environment for them? What are thing I have to look for in an unhealthy duck? Should they be around other ducks constantly? Do they need a mate (Will they get depressed even if I'm always with her)? What does it mean when her head keeps twitching when you hold her?