Depends on the situation and how these birds live now. You may need as many as 4 environments. If it's only one then it's going to have to be a lot bigger than a cage.
So what's the scoop?
I think for four you would need a mini aviary. Or a large macaw cage with cockatiel sized bar spacing.All four live together currently and i’m Wanting to adopt them all together. They’re hand tamed, and get along together but i don’t know the specifics of how they’re living. What measurements would you suggest?
That’s what I was going to suggest. I have 2 prevue hendryx F050 cages, the XL, that I got on Amazon. I removed sides and zip tied them together making it 7 feet long. I use them for finches.Maybe if you need to save space you could get 2 stackable flight cages.