I have a cage that is about 3 feet wide, 2 feet high and about 2 1/2 feet deep for Leo, my goffin cockatoo. He really is only in there for the 12 hours of sleep time he has and lots of toys inside. Some birds like wide, some like tall. Leo likes wide over talk because he can't fly, so if he were to fall, its best that his cage isn't that tall so he won't injure himself. Unless you have bird experience, and I don't mean cockatiels or budgies, you really shouldn't get any sort of cockatoo. I owned (or should I say they owned me) parrots and birds for over seven years ish before getting my cockatoo and did extensive reaserch for over a year before getting Leo. What bird experience and knowledge do you currently have? What do you invision owning a parrot such as a cockatoo to be like? Exactly what are your expectations? Besides sleep time, which ABSOLUTELY has to be 10-12 hours, how long will the bird be in the cage? Do you know how expensive bird toys are? Do you know that you will be buying many $20+ dollar toys a week? Do you know that it is essential for your parrot to DESTROY said expensive toys for their mental well being? What do you plan on feeding the bird? Seeds won't cut it and neither will just straight up pellets. Parrots need a large variety of veggies and all sorts of foods that most people wouldn't think about feeding a parrot. What happens when the bird screams at the top of it's lungs for hours on end or begins to joy scream? And they WILL scream. Cockatoos are, I think, one of the most common parrots to be dropped off as rescues because they are so loud and extremely difficult to take care of. While goffins are easier than your umbrella cockatoo, they are still cockatoos. I'm not trying to dissuade you from getting a cockatoo, I just want you to do a self check and a reality check because parrots everywhere suffer from people making decisions based off of incomplete or false information. No animal should have to suffer due to a mistake as large as impulse buys. If you want to know more about owning a goffin cockatoo, please feel free to ask me anything. I know I sound lecture-y right now, but this is just because I don't know what your intentions and expectations are. In my defense, and all the other people who jumped onto this thread, we as cockatoo owners tend to go into interrogation and information bombardment mode when we see people interested in cockatoos because they are a big commitment and we know first hand that they are smarter than you could even imagine. Please just read this post and answer these questions. It doesn't have to be in the form of a post response. Just answer them in your head and if the answer is that you didn't know some of the stuff I brought up, then simply put the pause button on getting a cockatoo and take some time to do some reaserch. Maybe even visit a cockatoo or talk to a cockatoo owner. Knowledge is power and you can never have too much knowledge when it comes to parrots.