Upon choosing appropriate large parakeet cages, the things to consider are cage location and accessories, shape, size and bar spacing, style, construction elements and upkeep, and cage materials. However, a bird keeper must keep in mind the general rule of thumb in choosing cages for parakeets: choose the largest birds cages for parakeets that can be afforded with suitable bar spacing for the bird.
Parakeets and budgerigars fall under the small parrots category, so bar spacing must measure up to in. or 2.3 mm.
One must also keep in mind that a parakeets tail feathers must not touch the bottom or the side of the parakeet cage whenever the bird sits on its perch. If this is neglected, a parakeets tail feathers might get damaged.