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Patreon: https://www.patreon.com/realscience
Twitter: https://twitter.com/stephaniesamma
Instagram: https://www.instagram.com/stephaniesammann

Credits:
Narrator/Writer: Stephanie Sammann
Writer: Angela Wipperman (https://www.angelawipperman.com)
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

Music:
dancing-on-the-snow by anbr
we-are-ready by angel-salazar
still-life by anbr
organism by roie-shpigler
pebbles-dance by roie-shpigler
thin-air by roie-shpigler
little-touch-of-heaven by marco-martini


References:

[1] https://ielc.libguides.com/sdz....g/factsheets/platypu
[2] http://www.biologyreference.co....m/A-Ar/Amniote-Egg.h
[3] https://www.nature.com/articles/nature06936
[4] https://www.nature.com/scitabl....e/topicpage/interpre
[5] http://www.nhc.ed.ac.uk/index.php?page=493.168.256
[6] https://pubmed.ncbi.nlm.nih.gov/19805098/
[7] https://www.jstor.org/stable/56816?seq=1
[8] https://platypus.asn.au/biology/
[9] https://bit.ly/35NqVaP
[10] https://www.reed.edu/biology/p....rofessors/srenn/page
[11] https://web.archive.org/web/20....190307003822/http://
[12] https://genomebiology.biomedce....ntral.com/articles/1
[13] https://pubmed.ncbi.nlm.nih.gov/18463304/