Spider Crabs
FAQ's Penzance Snorkelling

Where can I see Spider Crabs molting in Cornwall?

Back In August 2025 I filmed this amazing spectacle at Battery Rocks (at the back of Penzance Jubilee Pool) in Penzance. This phenomenon, known as “molting,” sees thousands of these giant crustaceans migrate from deep water to the shallows. The reason for the mass gathering is safety in numbers. As they shed their tough outer […]

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