Check out the episode about fish intelligence over on the main SciShow channel:
Hosted by: Brit Garner & Stefan Chin
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Sources:
https://www.biorxiv.org/content/early/2018/08/21/397067
http://radicalanthropologygroup.org/sites/default/files/pdf/class_text_023.pdf
https://www.uni-trier.de/fileadmin/fb1/PHI/Hoffmann_-_Dokumente/Gordon_Gallup_-_Self-recognition_in_primates.pdf
https://www.researchgate.net/profile/Gordon_Gallup2/publication/227823804_Self-Awareness_and_the_Emergence_of_Mind_in_Primates/links/5b6d8b6a92851ca65054aa06/Self-Awareness-and-the-Emergence-of-Mind-in-Primates.pdf
https://pdfs.semanticscholar.org/c03e/9ae94b08e77c9f6e1c0cd09f82df375347fb.pdf
http://www.psychology.emory.edu/cognition/rochat/Rochat5levels.pdf
https://theconversation.com/how-do-children-develop-a-sense-of-self-56118
http://www.psy.cmu.edu/~rakison/Asendorpf1996.pdf
https://www.theatlantic.com/science/archive/2017/02/what-do-animals-see-in-the-mirror/516348/
https://www.pnas.org/content/98/10/5937
https://www.nytimes.com/2001/05/01/science/brainy-dolphins-pass-the-human-mirror-test.html
https://www.sciencedirect.com/science/article/pii/S0376635701001346
https://www.pnas.org/content/103/45/17053
https://www.nationalgeographic.com/science/phenomena/2008/09/28/elephants-recognise-themselves-in-mirror/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2517622/
https://www.newscientist.com/article/dn14552-mirror-test-shows-magpies-arent-so-bird-brained/
https://pdfs.semanticscholar.org/6025/a64f817d6ef770e88449d9c0dea1a7a1c952.pdf
https://www.sciencealert.com/cleaner-wrasse-passes-mirror-self-recognition-test-self-awareness
https://www.nationalgeographic.com/animals/2018/09/fish-cleaner-wrasse-self-aware-mirror-test-intelligence-news/
https://qz.com/1501318/the-mirror-test-for-animals-reflects-the-limits-of-human-cognition/
https://pages.shanti.virginia.edu/13Sp_PSYC_4559-003_CGAS/files/2013/01/de-veer-van-den-bos-1999.pdf
http://altweb.astate.edu/electronicjournal/Articles/sp_issue_psychobio/06%20EJIBS%20Schwartz%20gorilla_Final.pdf
https://link.springer.com/article/10.1007%2FBF02382873
https://www.scientificamerican.com/article/kids-and-animals-who-fail-classic-mirror/
https://journals.sagepub.com/doi/abs/10.1177/0022022110381114
https://www.popsci.com/monkey-mirror-test-self-aware#page-4
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Images:
https://commons.wikimedia.org/wiki/File:Bluestreak_cleaner_wrasse_(Labroides_dimidiatus)_(40460962202).jpg