Why Were Predators Invented?

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Animals eating other animals seems like a tale as old as time, but it's only almost that old. Predation had to evolve in the Ediacaran period -- so let's look at early almost-predators like Auroralumina, Kimberella, Ikaria, and whatever punched holes in Cloudina.

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Sources:

Ikaria:
https://pubmed.ncbi.nlm.nih.gov/32412628/
https://www.pnas.org/doi/pdf/10.1073/pnas.2001045117
Kimberella:
https://www.cell.com/current-biology/fulltext/S0960-9822(22)01699-2
https://www.nhm.ac.uk/discover/news/2022/november/evidence-worlds-oldest-meal-may-have-been-discovered.html
Cloudina:
https://www.jstor.org/stable/3515782

General:
https://arxiv.org/pdf/2212.00899.pdf
https://doi.org/10.1016/j.tree.2008.07.015
https://doi.org/10.1017/S1089332600001133

Images:
https://www.eurekalert.org/multimedia/984654
https://commons.wikimedia.org/wiki/File:Kimberella.jpg
https://www.gettyimages.com
https://www.eurekalert.org/multimedia/711455
https://www.eurekalert.org/multimedia/989702
https://commons.wikimedia.org/wiki/File:1._%D0%94%D0%B8%D0%BA%D0%B8%D0%BD%D1%81%D0%BE%D0%BD%D0%B8%D1%8F_-_%D0%B8%D1%81%D0%BA%D0%BE%D0%BF%D0%B0%D0%B5%D0%BC%D0%BE%D0%B5_%D0%B6%D0%B8%D0%B2%D0%BE%D1%82%D0%BD%D0%BE%D0%B5_%D1%8D%D0%B4%D0%B8%D0%B0%D0%BA%D0%B0%D1%80%D1%81%D0%BA%D0%BE%D0%B9_%D0%B1%D0%B8%D0%BE%D1%82%D1%8B_(%D0%A1%D1%80%D0%B5%D0%B4%D0%BD%D0%B8%D0%B9_%D0%A3%D1%80%D0%B0%D0%BB).jpg
https://commons.wikimedia.org/wiki/File:Yorgia.jpg
https://commons.wikimedia.org/wiki/File:Charnia_masoni_Charnwood.JPG
https://commons.wikimedia.org/wiki/File:Yarnemia_acidiformis.jpg
https://www.inaturalist.org/observations/1917776
https://www.nature.com/articles/s41559-022-01807-x
https://www.eurekalert.org/multimedia/690364
https://commons.wikimedia.org/wiki/File:Elrathia_kingii_fossil_trilobite_with_healed_bite_mark_%28Wheeler_Formation,_Middle_Cambrian;_House_Range,_western_Utah,_USA%29_3.jpg
https://commons.wikimedia.org/wiki/File:Vendian_Fauna_(5528130308).jpg
https://commons.wikimedia.org/wiki/File:Kimberella_quadrata.jpg
https://commons.wikimedia.org/wiki/File:Kimberella_diorama.jpg
https://www.eurekalert.org/multimedia/966090
https://commons.wikimedia.org/wiki/File:Kimberella_NT.jpg
https://www.eurekalert.org/multimedia/928075
https://www.app.pan.pl/archive/published/app63/app004672018.html
https://commons.wikimedia.org/wiki/File:Ikaria_wariootia.jpg
https://commons.wikimedia.org/wiki/File:Spriggina_floundersi_-_MUSE.jpg
https://www.eurekalert.org/multimedia/687332
https://eurekalert.org/multimedia/928076
https://commons.wikimedia.org/wiki/File:Ikaria_wariootia_(cropped).jpg
https://www.mdpi.com/2075-1729/12/2/136
https://www.nature.com/articles/s41598-019-56317-x#Fig1
https://www.eurekalert.org/multimedia/725563
https://www.nature.com/articles/s41598-017-05753-8#Fig8
https://www.nature.com/articles/s41598-017-05753-8#Fig4
https://commons.wikimedia.org/wiki/File:Cloudina_NT.jpg
https://commons.wikimedia.org/wiki/File:Natica_hebraea.jpg
https://commons.wikimedia.org/wiki/File:Cloudina_fossils_(Neoproterozoic;_Corumba,_Brazil)_(45453979394).jpg
https://www.nature.com/articles/s41598-021-90768-5/figures/1
https://commons.wikimedia.org/wiki/File:Ediacaran_trace_fossil.jpg
https://www.eurekalert.org/multimedia/881103
https://www.eurekalert.org/multimedia/919689