Choosing a Cage
When choosing a cage for your bird, remember that you need the largest cage you can afford in order to benefit from daily exercise. The cage you select should be large enough so your bird can fully extend its wings without having the wings touch the sides of the cage. The bird shoud also have ample clearance for its head from the cage ceiling and its tail from the cage floor when sitting on its perch. In addition to your bird, the cage must hold a few perches, some toys, a food bowl, and a water bowl.
If space is a concern, I would recommend eliminating the large parrots, such as macaws and cockatoos, from consideration. These birds, kept in appropriate sized cages, can occupy as much space as full-size refrigerator! If these large parrots are not allowed the opportunity to exercise outside of their cages, they may develop some behavior probems, such as screaming or biting.