Is there any living creature with an entirely metal natural body part?

No known living creature has an entirely metal natural body part. While some organisms, like certain species of mollusks and arthropods, incorporate metals into their shells or exoskeletons, these metals are typically in trace amounts and not in a pure metallic form. Additionally, some bacteria can accumulate metals, but they do not possess metallic body parts. Overall, living organisms exhibit a variety of biological materials, but pure metal structures are not found in nature.