We've been warning you about a surge in sighting of Portuguese Man O' War washing up on our beaches.

Last week one showed up at Beach Haven, and a vacationer got some great footage.

Beachgoers should be careful and avoid them, because even dead ones remain toxic to humans and animals.

According to National Geographic, the Man O’ War is a siphonophore, an animal made up of a colony of organisms working together, so if you see one, there are likely many others in the vicinity. The sting is “excruciatingly painful” to humans but rarely deadly; however, it can paralyze smaller creatures.

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