Feather loss in pet birds has two broad categories: normal molting and abnormal loss, which includes feather plucking and medical causes. Understanding the difference is essential for knowing when to intervene.

Molting is a natural process where birds shed old feathers and grow new ones, typically once or twice a year. During a molt you will find intact feathers on the cage floor, and you may notice small pin feathers emerging on the head and body. Your bird might be slightly irritable or less active but should continue eating and drinking normally.

Feather plucking, also called feather-destructive behavior, is when a bird actively pulls out, chews, or barbering its own feathers. The resulting feathers often look ragged, broken, or chewed rather than cleanly shed. Bare patches on the chest, legs, or under the wings are common signs. Plucking can stem from boredom, stress, hormonal imbalance, lack of sleep, poor diet, low humidity, or underlying medical conditions.

Nutritional deficiencies, particularly low vitamin A, calcium, or amino acids, can cause poor feather quality and excessive loss. Birds on seed-only diets are especially vulnerable. Skin infections caused by bacteria, fungi, or mites can also trigger feather loss, often accompanied by crusty skin, redness, or unusual odor.

Other medical causes include psittacine beak and feather disease (PBFD), liver disease, thyroid imbalance, and heavy metal poisoning. These conditions require diagnostic testing by an avian veterinarian, including blood work and feather follicle analysis.

If your bird is losing feathers outside of a normal molt pattern, shows bare skin, has damaged feather shafts, or exhibits behavioral changes, schedule a veterinary exam promptly. Early intervention dramatically improves outcomes for both medical and behavioral feather loss.