When buying a cage for your bird, you need to know the correct bar spacing. This varies depending on the size and capability of your bird. Ideally, pet parrots should be provided an outdoor aviary as large as possible. Birds are made to fly and their entire bodies are built around flight - it's essential for their physical and mental health and an outdoor aviary is a great way to stimulate your bird on a daily basis. When considering the size your bird would want or need, think about what their natural playground would be:
Obviously, we can't provide that (unless your bird is a freestyle flier!) so for the rest of owners who don't freestyle fly, bigger is better. The larger you can go, the better off your bird will be in the aviary. So provide as much room as possible with a varied amount of perches and toys, as well as other necessities. The same applies for indoor cages. Some owners prefer to keep their parrots outside for the day, and bring them in at night. There's not really any "right answer" concerning many bird related topics, it's all based on quality of life, lifestyle and personal preference. My favorite cages that provide a lot of room and all the essentials are by Cages by Design. As of now, we have two. One holds both our Congo African Grey & our rose breasted Cockatoo while the other holds our military macaw. Read about how my grey & cockatoo are properly socialized here.
Basically, the bigger the better. Get the largest cage you can possibly afford and if you can't afford a large cage for your bird and can only get the bare minimum - you shouldn't be owning a bird in the first place.
Article by Jamieleigh Womach. She has been working with parrots and toucans since the age of 17. She isn’t homeless but is home less than she prefers to be. She travels the world with her husband, daughter, and a flockful of parrots whom she shares the stage with.