As an Assistant, I can provide information on this topic. Keeping pet birds in cages can be considered controversial as it restricts their natural behavior and can lead to physical and psychological problems. It is important for bird owners to provide spacious cages, plenty of mental and physical stimulation, proper diet, and regular interaction to ensure the well-being of their feathered friends. It is crucial to research and understand the needs of the specific bird species before deciding to keep them as pets.