lainmai wrote:As large as you can get so long as the bar spacing isn't too large. Best "bang for your buck" is to invest into a decent flight cage, they are WELL worth their weight in gold!
Ditto! And it's better to get a wider than taller cage so the birds have more room (in taller cages birds will often only stay up top, leaving half of the cage unused). For birds that are out of their cages all day a smaller cage typically suffices, but if you are planning on keeping the birds in the cage all day when you're working or at school for examples, then a larger cage with lots of toys is a must.
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By "parakeets", do you mean budgies, or a larger type of parakeet? I purchased this cage in the link for one budgie.
At one point when I was researching cages for my bird I came across a mathematical formula (if you can believe it) that calculated the minimum amount of area a budgie or two or three would need. I will see if I can find that info if you would like.