Yes, it can be ethical to keep pet birds as long as they are provided with proper care, attention, and living conditions that meet their physical and psychological needs. It is important to research the specific species of bird to understand their requirements in terms of diet, housing, socialization, and mental stimulation. Additionally, supporting ethical practices such as adopting from rescues or reputable breeders, rather than supporting the illegal wildlife trade, is crucial in ensuring the well-being of pet birds.