What are common cockatiel feather problems and how can they be treated or prevented?

Common cockatiel feather problems include feather plucking, feather picking, and feather cysts. These issues can be treated by addressing underlying health or behavioral issues, providing a balanced diet, ensuring proper grooming, and creating a stimulating environment. Prevention involves regular vet check-ups, a healthy diet, and addressing any stress or boredom that may lead to feather problems.