If a Staryu loses any of its appendages it can grow them back with ease provided the core is still fully intact. It can adapt its skin in multiple ways including changing its colour, hardening the surface of its body, even reducing its overall mass. Staryu's eating habits are unknown but it's very probable it filter feeds considering the Pokémon's lack of a mouth. Staryu is also one of three Pokémon that lack eyes: the other two are Starmie and Zubat. It evolves into Starmie when exposed to a Water Stone. PaperPokes
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Staryu