Some species Sharks are so ferocious that they’ll eat each other in the womb! But what sounds viscous is actually a survival trait shared by other species.
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Sharks
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3645029/
Salamanders
https://onlinelibrary.wiley.com/doi/epdf/10.1002/%28SICI%291097-010X%28199811/12%29282%3A4/5%3C507%3A%3AAID-JEZ7%3E3.0.CO%3B2-0
https://core.ac.uk/download/pdf/36141363.pdf
Insects
https://link.springer.com/article/10.1007/s00114-006-0213-z
https://academic.oup.com/jinsectscience/article/4/1/36/888438
Humans
https://scholar.archive.org/work/r44qzqnuzvgkni743javxu2feu/access/wayback/https://www.cambridge.org/core/services/aop-cambridge-core/content/view/0D4FC2D88128621DE0A28CA9A1653190/S0001566000008278a.pdf/div-class-title-the-vanishing-twin-div.pdf
IMAGES
https://www.gettyimages.com/detail/photo/fire-salamander-royalty-free-image/528101891
https://commons.wikimedia.org/wiki/File:Carcharias_taurus_newport.jpg
https://commons.wikimedia.org/wiki/File:A_massive_Sand_tiger_Shark_swims_by_(27287498303).jpg
https://www.gettyimages.com/detail/video/marble-ray-at-giant-undersea-canyon-ogasawara-japan-stock-footage/1162378258?phrase=underwater%20sand%20ocean&adppopup=true
https://commons.wikimedia.org/wiki/File:Salamandra_salamandra_BM3.jpg
https://www.gettyimages.com/detail/photo/fire-salamander-royalty-free-image/172882837?phrase=fire%20salamander&adppopup=true
https://www.gettyimages.com/detail/photo/closeup-on-a-dark-larvae-hokkaido-salamander-royalty-free-image/1421229192?phrase=salamander%20larva&adppopup=true
https://www.inaturalist.org/observations/93044997
https://www.inaturalist.org/observations/32993131
https://academic.oup.com/jinsectscience/article/4/1/36/888438
https://commons.wikimedia.org/wiki/File:The_Sand_Tiger_Shark_with_Sea_Turtle.jpg
https://commons.wikimedia.org/wiki/File:Salamandra_salamandra_01_by-dpc.jpg
https://www.gettyimages.com/detail/photo/cropped-shot-of-an-unrecognizable-mother-to-be-royalty-free-image/1368416956?phrase=pregnant&adppopup=true