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Why should you care about the spread of poisonous, thumbnail-sized jellyfish in Australian coastal waters, which, at worst, threaten to sting to death a couple thousand beachgoers on the other side of the world? Well, what if those tiny invaders also managed to shut down a Hollywood production that was set to reignite the sizzling chemistry of beloved screen staples Kate Hudson and Matthew McConaughey? Then, perhaps, you'd begin to grasp the scope of the ecological disaster at hand:

Irukandji jellyfish are among the world's most toxic creatures - all but impossible to detect in the water but packing a potentially lethal punch belying their tiny size.

Until recently it was thought that they were confined to Australia's northern tropical waters, but marine biologists have now found them off Queensland's Fraser Island — a popular tourist spot about 400 miles south of their previously assumed range.

Their discovery has halted production of a Hollywood film, Fool's Gold, starring Kate Hudson and Matthew McConaughey, who were originally due to be filmed swimming in the sea. Dr Jamie Seymour, from James Cook University, said she had found five of the animals off the island.

The jelly-killers' southern migration tragically ruined a planned shot, in which McConaughey was to tear off his top and immerse himself in Queensland waters, later emerging to find Hudson admiring his glistening, bronzed torso. Instead, the actor came running out of the ocean, screaming, "The tiny monsters! They're all over me! They're eating me alive!" which most of the cast and crew assumed was just an ugly, hallucinatory holdover from his magic mushroom adventures of the evening before.