Cleanliness
Without this virtue your aviary will be a breeding ground for disease and disaster. You must clean you aviary often to keep disease among your birds to an absolute minimum. There are cases where every bird in an aviary had to be destroyed because of disease which has come from uncleanliness. If the floor of your aviary is dirt then rake it weekly and turn the dirt each spring. If your floor is wood or concrete then wash it regularly. Keep food and water dishes clean at all times. Many diseases are undetectable by the beginner so cleanliness is ultra-important. One bird from an infected aviary that is introduced to another aviary and so on and so on can cause great damage. There are a number of disinfectants available to keep disease down (a common solution consisting of 1 part bleach to 25 parts water is often used).