Sources

All read on 2026-11-02.

• MSD Veterinary Manual: Minimum and Bar Spacing Recommendations (table)
• Budgerigar Council of South Australia: Budgerigar Cages (Dec 2023)
• Budgerigar Council of South Australia: Budgie Lifespan (Jul 2023)
• MSPCA-Angell: Suggestions for Housing Birds

Statements marked as general knowledge in a guide have no single source and are kept general on purpose.