Telegraph (UK): Deadly Portuguese Man O’ War jellyfish have been spotted off the British coast, prompting warnings to holidaymakers. The creature, one of the deadliest in the world, was identified near Land’s End, Cornwall. Commonly thought of as a jellyfish, it is actually a siphonophore – a colony of organisms resembling jellyfish. Incapable of propelling itself, using the wind or current to move, it usually floating on the surface with its tentacles, on average one metre long, …