Incredible footage shows just what the Portuguese man o' war look like as they wash up on multiple beaches in Cornwall.

The highly venomous jellyfish-like creatures have been washed up on Cornish beaches by the wind and waves from the recent storms.

The Portuguese man o' war is not a jellyfish, but a floating colony of tiny marine animals, called hydrozoans, all working together collectively.

This footage was filmed on October 8.

Highly venomous Portuguese Men O'War jellyfish have been washed up on Cornish beaches by the wind and waves from the recent storms. The colourful balloon like air sac makes them easy to spot on a beach walk, but the long tentacles pack a powerful sting.

The Portuguese Man o'War is not in fact a jellyfish, but a floating colony of tiny marine animals, called hydrozoans, all working together collectively.

Dogs can have an adverse reaction to biting or swallowing them though, so always check what your pet is eating on the beach and see a vet if they get stung. Lifeguards may also be able to help