Choosing a cage
When choosing a cage your bird needs 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 the wings touching the sides of the cage. The bird should also have ample clearance for its head from the cage ceiling and its tail from the cage floor when sitting on its perch. In addiiton to your bird, the cage must hold a few perches, some toys, a food bowl, and a water bowl. Be careful not to place perches over the food or water bowl because the bird can and will contaminate the food and water by eliminating in it.
Here are the recommended bar spacing for commonly kept pet birds: budgies/parakeets, canaries, finches, and lovebirds, 3/8 inch; cockatiels and small conures, 1/2 to 3/4 inch; Amazons, African greys and other medium-sized parrots, 3/4 to 1 inch; macaws and cockatoos. 3/4 to 11/2 inches.