If you wish to breed for a certain variety, learn about budgie varieties and genetics. Each pair should be set up in their own cage at least 24″w x 16″d x 16″h (70x40x40cm). The cage should not have a grate on the bottom. If the cage has an irremovable grate, place the newspaper lining on top of the grate. Use only black and white newspaper to line the bottom.