Thousands of swimming crabs are invading British waters.
Swarms of Henslow crabs are coming to the UK's east coast from their natural habitat off of Portugal due to an increase in sea temperatures.
The crustaceans are not dangerous to people but could have an effect on local species.
Unlike other crabs who walk on the sea bed, this breed uses their specially modified limbs, which are flattened at the tips, to swim through the water.
Plymouth University's Dr. Richard Kirby - who made the discovery while leading a study into the increase of planktonic larvae of North Sea decapods - said: "They could give you a nasty nip."
