Budgies and cockatiels need width more than height, because they fly across a cage rather than up it. Thirty inches gives a small flock room to make real flights between perches instead of hopping. The divider lifts out, so the same cage is either one wide aviary or two separate homes, which is what you want during a quarantine, a bonding period, or when a pair will not settle. Two security doors open for cleaning and four feeding doors let you change water without opening the whole front. The slide out tray and mesh grate mean the daily clean is a tray change, not a rebuild. Cages stack if you run two.