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Listing the octopus as part of the cast makes a lot of sense because she is literally the main protagonist of the film. There's no rule that says that cast members in a movie need to be human.
I do agree with not listing the shark, as there were many sharks featured in the movie and they have lesser significance to the overall message of the movie.
Current image is suspect
I can't prove anything, but I also can't find any official source for that image beyond a lot of references to Twitter, and one single reference to 4chan (which also seems to be the oldest one Google's reverse image search knows about). And the account that added it has been removed. Also the style of the image (which looks like the cover of a romance novel) seems to feed into some recent controversy around this Documentary. As an non-subscriber I can't confirm it doesn't appear anywhere on NetFlix, which is why I am posting this here instead of changing it myself. NipokNek (talk) 21:12, 21 September 2020 (UTC)[reply]
I took a quick look on Netflix, and did not see this image. I think it would be reasonable to remove the image since it is badly sourced. Cheers! Doctormatt (talk) 01:04, 22 September 2020 (UTC)[reply]