The different plants and animals adapted to live in several layers of the rainforest.
What Is Parrot Fever? Parrot fever, also called parrot disease and psittacosis, is very rare. According to the Centers for Disease Control and Prevention, there have been fewer than 50 confirmed cases per year in the United States since 1996, although many cases may have gone undiagnosed or unreported (CDC).
The exact cause for many rare diseases remains unknown. Still, for a significant portion, the problem can be traced to mutations (changes) in a single gene. Such diseases are referred to as rare, genetic diseases. Many of these genetic mutations can be passed on from one generation to the next, explaining why certain rare diseases run in families. It is important to keep in mind that genetics are just one piece of the puzzle.