Film credits

AviaNZ Research Group, Ponui Island

Colin and Kiwifruit video - Remutaka Conservation Trust

Photo credits

Litte Spotted Kiwi: By Kimberley Collins - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=77609526

Flying Kākā: By Pseudopanax at English Wikipedia - Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=101245244

New Zealand Falcon: By Tony Hisgett from Birmingham, UK - New Zealand Falcon, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=64140391

Saddleback: By Duncan Wright - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=2997330

Tūī: By I, Tony Wills, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=7807217

Scrapping Kākā: By Kate Macbeth - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=79568115

Sparrow: By Peter P. Othagoer - Own work, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=76252576

Eastern Rosella: By Patrick Kavanagh - https://www.flickr.com/photos/patrick_k59/36771792241/in/dateposted/, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=62106561

Adult Kākā: By Judi Lapsley Miller - Own work, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=71562491

Human Larynx: By Alan Hoofring (Illustrator) - This image was released by the National Cancer Institute, an agency part of the National Institutes of Health, with the ID 4357 (image) (next)., Public Domain, https://commons.wikimedia.org/w/index.php?curid=24052144

Hihi: By Judi Lapsley Miller - Own work, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=86013298

Long-tailed Cuckoo: By J. G. Keulemans delt. & lith. [Plate XIV, 1888]. - Alexander Turnbull Library, URL [1], Reference No.PUBL-0012-14, Public Domain, https://commons.wikimedia.org/w/index.php?curid=1662077

Titipounamu: By Chris Gee - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=78405254

Bird Shapes: https://az.audubon.org/sites/default/files/styles/hero_mobile/public/bird_shapes.png?itok=ynMZBzRw

Black-backed Gull: By Bernard Spragg. NZ from Christchurch, New Zealand - Black-backed gull New Zealand., PDM-owner, https://commons.wikimedia.org/w/index.php?curid=103432319

Kingfisher: By Sid Mosdell from New Zealand - Kingfisher, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=70734965

Kākāriki: By Pseudopanax at English Wikipedia - Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=91122901

References

https://academy.allaboutbirds.org/birdsong/

Lovette, I. J. & Fitzpatrick, J. W. (Eds.). (2016). The Cornell Lab of Ornithology Handbood of Bird Biology (3rd ed.). Cornell University. 

All other photos and film clips are my own.