Keeping pet birds can be ethical as long as their physical and emotional needs are adequately met. It is important to provide a safe and comfortable environment, proper nutrition, social interaction, mental stimulation, and access to veterinary care for pet birds. Additionally, it is essential to consider the well-being and conservation status of the species before deciding to keep a bird as a pet. It is recommended to research and understand the specific needs of the bird species you are considering keeping as a pet to ensure you can provide a suitable and enriching life for them.