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Did Dinosaurs Have Belly Buttons?

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Belly buttons are, typically, a human's first scar. A sign that you used to feed through an umbilical cord that connected your tummy to a placenta. But it turns out you don't have to feed from a placenta to get a similar scar. It might just be a little hard to find.

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Sources:
https://theconversation.com/curious-kids-do-all-animals-have-belly-buttons-192696
https://education.nationalgeographic.org/resource/belly-button-biodiversity/
https://www.medicinenet.com/what_is_the_belly_button_for/article.htm
https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/placenta/art-20044425
https://www.akc.org/expert-advice/dog-breeding/do-dogs-have-belly-buttons/
https://cooperpetcare.com/do-cats-have-belly-buttons/
https://whyrabbits.com/do-rabbits-have-belly-buttons/
https://www.nhm.ac.uk/discover/do-sharks-lay-eggs.html
https://www.britannica.com/animal/Amniota
https://bmcbiol.biomedcentral.com/articles/10.1186/s12915-022-01329-9
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4446324/
https://www.nhm.ac.uk/discover/when-did-dinosaurs-live.html

Images:
https://www.gettyimages.com/
https://commons.wikimedia.org/wiki/File:Spiny_Dogfish_Pup_(cropped).jpg
https://saveourseas.com/update/umbilical-scars/
https://www.researchgate.net/publication/361150689_Oldest_preserved_umbilical_scar_reveals_dinosaurs_had_%27belly_buttons%27
https://www.cell.com/current-biology/fulltext/S0960-9822(16)30706-0?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0960982216307060%3Fshowall%3Dtrue
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Documentary
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