Learn to modify to fit your species' needs. This may mean you will make up different bowls of food because many of us keep mixed species. Fat content and protein are two of the most important food areas to consider. Some species such as African greys, cockatoos and amazons tend to have problems with excessive weight. These species should not be fed a high fat diet.
Most people see the word fat and think BAD - heart problems, clogged arteries, overweight.
However, this is not quite the whole truth. There are differences between saturated and non saturated fats. Some saturated fats can cause problems with cholesterol resulting in clogged arteries and contributing to heart problems. Some nuts actually have been determined to be health aids, a good source of protein. Many doctors claim nuts added to the diet are healthy and although they contain fat they also control fat.