ah, so I know it as slug... but you are right it seems hare it legit too, e.g., https://en.wikipedia.org/wiki/California_sea_hare …
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just on that tangent I am not from an English-speaking country either just to clarify why I mentioned it

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I know not the same but reminds me a huge (although not this big) hermit crab I found on the beach on Holbox