Some sea slugs (Elysia marginata & Elysia atroviridis) purposefully decapitate themselves in order to facilitate the growth of a new body.
Researchers suspect these sea slugs ditch their bodies when they become infected with internal parasites.
https://www.nytimes.com/2021/03/08/science/decapitated-sea-slugs.html?utm_source=Nature+Briefing&utm_campaign=3d9abe9084-briefing-dy-20210309&utm_medium=email&utm_term=0_c9dfd39373-3d9abe9084-43576073
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