Chain
The famous gold triceratops shellfish is good for only one thing, and that's being made into chains. They link their triceratops horns together and form an unbreakable gold chain. You can't eat them, because they're gold. So they're only really good for their chaining together ability.
さ
くさり, とざ
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However, the only way to break the chain is to saw (さ) it open. Once the triceratops shellfish start holding on, they never let go. So when you want to take the chain off you have to really hack at it with your saw.