I see many posts regarding how to treat sick and injured birds, but can't find anything regarding healthy birds. I know how to check their poo, I've seen the poop chart (must see for newbies) but what else can I check to ensure my birds are healthy? I don't want to wait until they are very sick and its obvious. I would like to know how to tell they are healthy. Then I won't have to wait to know when something is wrong and it will allow me to know sooner and hopefully have fewer casualties to illness or injury.