Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to take care of a budgie [title] Buy a big cage. [step] Birds need to have some space to play and stretch their wings. If you care about their well-being, try to find a model which lets the light go through.

Ending1: Cockatiels only need a cage with a built-in screen, mirrors, and additional locks. You may want to keep your parrot in a small play pen or box if your current budgie doesn't have a cage available. Ending2: Cockatiels will be more interested in interacting with each other if you buy a large cage. [substeps] If you are going to actually use a cage, make sure you won't overfill it or you may have to get one smaller. Ending3: [substeps] They should also have a cage that allows them to roam. These cages can be found at most veterinary offices, so a 1000-gallon tank could be a good bet. Ending4: The cage should be at least 50 centimeter (19. 7 in) d x 60 centimeter (23.6 in) h x 80 centimeter (31.5 in) w.

Answer format: ending1/ending2/ending3/ending4