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| · | Malnutrition |
| · | Obesity |
| · | Too much vitamin supplementation |
| · | Liver, kidney and pancreatic disease |
| · | Aspergillosis |
| · | Candida |
| · | Giardia |
| · | Staphylococcus |
| · | Zinc, lead or copper toxicity |
| · | Sensitivity to cleaning agents |
| · | Food allergies |
| · | Allergies to other pets |
| · | Exposure to smoke and nicotine |
| · | Dirty feathers from the lack of a good bath |
| · | Bacterial infection of the skin follicles |
| · | Bacterial, viral infection, or protozoal infection such as Giardia |
| · | Nutritional deficiency |
| · | Allergies |
| · | fungal infections |
| · | bad wing-feather trim |
| · | fracture that has healed improperly can cause the bird neurologic pain and make him or her start picking at the area |
| · | hormones – seasonal – known as brood patch plucking. Some birds pluck the area of feather on the chest or abdominal area that is used during incubation to transfer heat to the eggs. Both sexes can do this. |
| · | Behavioral component – being “intact” and yet having no mate, no territory, and no flock. The anxiety from not being able to complete the instinctive breeding cycle. |
| · | Sexual frustrations can be exaggerated it the bird is pair-bonded with his or her owner. If the person gives more attention to another person in the room, the bird could feather pluck. |
| · | Environmental causes – cage too small, wrong perches in the cage |
| · | Exposure to tobacco smoke and aerosol sprays. |
| · | Low humidity |
| · | Lack of full spectrum lighting (fluorescent light flickering might be very frustrating to a bird). |
| · | Not enough mental stimulation - bored |
| · | Being under too much stress (fighting in the home, addition of a new pet or family member, move of the bird’s cage next to a window |
| · | In most situations, feather picking is multifactorial |
| · | Positive reinforcement from feather picking |
| · | Injury - like a cracked keel |
| · | If no problems medically – vet might refer you to a behavior consultant |
| · | Stress from owner’s lives making the bird stressed |
| · | It has become a habit |