An infectious disease is one capable of producing disease or of producing an infection.

Birds are susceptible to a wide range of toxic substances which can injure or kill birds either by ingestion (eating) or inhalation (breathing them in). There are numerous reasons for this, including their small size, rapid metabolism, and sensitive respiratory systems.

Specific diseases or conditions affecting the reproductive system of birds.

There are a number of disorders and disease that can affect birds skin and feathers. Some which can be inherited, contracted, or behavioral in nature.