Spider crabs swarm in shallow waters on Cornish beach Wildlife

Thousands of venomous crabs converged on the beaches of Cornwall due to rising sea temperatures caused by the climate crisis. The migratory creatures swarmed in the shallow water in St Ives, shedding their shells before returning to depths of up to 300ft.

The crustaceans are instantly recognizable for their long legs and pincers and have a venomous bite that is poisonous to their prey but harmless to humans.

Their presence at Porthgwidden Beach was enough to put many bathers off entering the sea.

However, Kate Lowe, a marine photographer captured the event just days after a snorkeler was bitten by a blue shark during an excursion off Penzance.

The spider crabs spotted gathering at St Ives, Cornwall, to shed their shells before returning to the depths. Photograph: @cornish.coast/BNPS

Kate said: “I go snorkelling most of the time throughout the year, but I have never seen spider crabs in such numbers. When we turned up at the beach, it looked as though there were lots of dark rocks under the surface.

“But it turned out that there were thousands of crabs just two or three steps into the water. It was just really incredible, they were only knee-deep. I was able to float on the water above them and tried not to step on them.

“A lot of the tourists were squealing at the sight of them. Their shells were just floating around.”

Experts say while it is not unusual to see them in British waters, mass gatherings are becoming more common in the summer because of the rising sea temperatures linked to the climate crisis.

Spider crabs – Hyas araneus in Latin – usually gather in huge numbers in shallow water to protect themselves from predators while they wait for their new exoskeletons to thicken and toughen up.

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