The US government has warned that enormous swarms of killer jellyfish - some the size of fridges and weighing up to a quarter of a ton - are ravaging the world's oceans. Particularly aggressive specimens are said to be capable of causing serious damage to ships, and have even managed to knacker nuclear power plants.
News of the challenge to humanity's dominance over planet Earth comes from the US National Science Foundation, which has put out a chilling warning entitled - rather beautifully - Jellyfish Gone Wild!
"When jellyfish populations run wild," the NSF jellyboffins warn, "they may jam thousands of square miles with their pulsing, gelatinous bodies."
It seems that no less than half a billion "refrigerator sized" slimy horrors weighing 450 pounds each invade the Sea of Japan daily, while Australian waters are plagued with "deadly, peanut-sized" Jellybabies of Death. It took the scyphozoan (or possibly hydrozoan) hordes just eight years to seize control of the Black Sea, apparently.