Sometimes the presence of mites or a deficiency of food causes the feathers to fall in various places with the result that many parts of the body can be affected, such as baldness.
The causes are to be found in:
- The humidity of the air in the environment where the birds live.
- Too high temperature
- Incorrect installation of cages (poorly ventilated room).
- A great dryness of the air and also an insufficient cleaning.