Hydling

From Wikitroid, the Metroid wiki

A Hydling is a small aquatic creature that lived in Torvus Bog's upper and lower regions. They travel in packs for safety, and although they are of no worry to larger organisms, their bite can puncture metal.

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"Hydlings are small water dwellers. They travel in packs for safety, roaming the water in search of bits of food. Their only defense is a bite, which with their sharp teeth can also pierce metal."