Giant flying squid have invaded the shallow waters off San Diego,California, spooking scuba divers and beachgoers after washing up dead on the beaches.
The carnivorous cephalopods, which weigh up to 45kg (100lb), came up from the depths last week, with swarms of them roughing up unsuspecting divers. Some reported tentacles enveloping their masks and yanking at their cameras and gear.
Stories of close encounters with the squid have chased many divers out of the water and created a whirlwind of excitement among those torn between their personal safety and the once-in-a-lifetime chance to swim with the deep-sea giants.
The so-called Humboldt squid, named after the current in the eastern Pacific, have been known to attack humans and are nicknamed "red devils" for their rust-red colouring and mean streak. Divers wanting to observe the creatures often bait the water, use a metal viewing cage or wear chainmail to avoid being lashed by the creature's tentacles.
The squid, which is most commonly found in deep water from California to the bottom of south America, hunts in schools of up to 1,200 individuals, can swim up to 15 mph and can skim over the water to escape predators.
"I wouldn't go into the water with them for the same reason I wouldn't walk into a pride of lions on the Serengeti," said Mike Bear, a local diver. "For all I know, I'm missing the experience of a lifetime."
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Jumbo squid that can grow up to 7 feet long and weigh more than 110 pounds are invading central California waters and preying on local anchovy, hake and other commercial fish populations, according to a study published Tuesday.
An aggressive predator, theHumboldt squid — or Dosidicus gigas — can change its eating habits to consume the food supply favored by tuna and sharks, its closest competitors, according to an article published in the Proceedings of the National Academy of Sciencesjournal.
"Having a new, voracious predator set up shop here in California may be yet another thing for fishermen to compete with," said the study's co-author, Stanford 
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