ᵃ Flightless birds of New Zealand View the website
ᵇ CRC Handbook of Avian Body Masses, 2nd Edition by John B. Dunning Jr. (Editor). CRC Press (2008), ISBN 978-1-4200-6444-5. View on wikipedia
ᶜ Lek Mating. View on wikipedia
ᵈ Kakapo climbing trees. View The video
ᵉ Male Kakapo "Booming" and "Chinging" View the video