Is metal-based, or other non-carbon-based, life realistic?

One science fiction short story I read (I don't remember the title or author, sorry!) featured some small creatures (unnamed) that were formed from metal, with the argument that "just like life developed on Earth with a carbon base, why shouldn't life be able to form elsewhere, with a metal base?"

Is this realistic?
Is there anything similar to this that already exists on Earth (ie, life based on something other than carbon)?

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Is metal-based, or other non-carbon-based, life realistic?

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