Costasiella kuroshimae—also known as a “leaf slug”,[1] or “leaf sheep”[2]—is a species of sacoglossan sea slug. Costasiella kuroshimae are shell-less marine opisthobranch gastropod mollusks in the family Costasiellidae.[3] Despite being animals they indirectly perform photosynthesis, via kleptoplasty.[4]
Just look at that little homie.
https://manoa.hawaii.edu/exploringourfluidearth/biological/aquatic-plants-and-algae/structure-and-function/weird-science-kleptoplasty
TIL.