Limpets can attach to other surfaces like boat hulls, not exclusively rocks. The boat's hull was covered in limpets after a month at sea.
Pro Tip 2/3
Natural Adhesive
Limpets produce a powerful natural adhesive, which makes them an analogy for a strong grip. His grip on the rope was like a limpet, unwavering and secure.
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Eco-friendly focus
Limpets are often mentioned in discussions on marine life and eco-system health. The limpet population is an indicator of water quality in the bay.