The Giant Fish That Makes Milk

From Real Science. ( YouTube / Nebula )

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Credits:
Narrator: Stephanie Sammann
Writer: Lorraine Boissoneault
Editor: Dylan Hennessy (https://www.behance.net/dylanhennessy1)
Illustrator/Animator: Kirtan Patel (https://kpatart.com/illustrations)
Animator: Mike Ridolfi (https://www.moboxgraphics.com/)
Sound: Graham Haerther (https://haerther.net)
Thumbnail: Simon Buckmaster (https://twitter.com/forgottentowel)
Producer: Brian McManus (https://www.youtube.com/c/realengineering)

Imagery courtesy of Getty Images

References:
[1] https://news.mongabay.com/2013/07/forgotten-species-the-arapaima-or-dinosaur-fish/
[2] https://pubmed.ncbi.nlm.nih.gov/22512942/
[3] https://nationalzoo.si.edu/animals/arapaima
[4] https://pubmed.ncbi.nlm.nih.gov/24816264/#:~:text=The%20scales%20of%20the%20arapaima,hard%2C%20highly%20mineralized%20surface%20layer.
[5] https://sci-hub.se/https://science.sciencemag.org/content/227/4688/782.abstract
[6] https://sci-hub.se/https://journals.physiology.org/doi/pdf/10.1152/ajplegacy.1935.111.2.352
[7] https://sci-hub.se/https://www.researchgate.net/publication/241692058_The_role_of_prolactin_in_fish_reproduction
[8] https://zoologyweblog.blogspot.com/2018/03/arapaima-milk-reflections-on-big-fish.html
[9] https://blog.nationalgeographic.org/2014/06/26/arapaima-conservation-its-happening-at-the-local-level-in-guyana/