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Men-of-war discovered on Cornish beaches

7 September 2012 Last updated at 18:18 BST

Beach-goers in Cornwall are being warned about an unusual visitor to the county which can deliver a powerful sting.

Portuguese men-of-war, which are normally a resident of warmer waters, are being washed up along the coastline.

A boy, Dawud Lee, needed hospital treatment after being stung.

He said it felt like "a little knife going into my foot".