Measure usable movement, not an empty cage
Start with adult size, wingspan, tail length, and activity level. Width usually matters more than height because most pet birds need useful side-to-side movement.
Measure the usable space
Perches, bowls, and toys shrink a cage fast. After setup, the bird should still have open space to turn, stretch, climb, and flap.
Bar spacing is part of size
A large cage is unsafe if the bird can push its head through the bars. Match spacing to the smallest bird using the cage.
Plan for cleaning
A cage that is too awkward to clean will not stay clean. Look for access doors, a simple tray, washable surfaces, and room placement that lets you work safely.
Clean hands, separate tools
Wash hands after cleaning liners, bowls, perches, toys, or other bird equipment. Use a cleanup area away from the kitchen sink and food-preparation surfaces, and store bird tools separately from human food.


