Birds have specific housing requirements for their health and well-being, and the commercially available bird-feeders, no matter how large, do not meet these requirements and are not a housing option for birds. A bird's housing must include space for eating, nesting, play, water, perching and short flight
A bird cage must be tall and wide. Even small species such as canaries and finches need space to fly. Furthermore, having easy access to clean the cage such as having a removable tray is important. The cage needs a door to either place the bird inside and remove the bird. The walls should not be made of solid material. Generally, cages are metal and have bars spaced small enough apart so that the bird cannot fit its head through.