Woman suffers multiple bites from highly toxic blue-ringed octopus.

A woman in Australia was bitten twice on her abdomen by a blue-ringed octopus, one of the world's most toxic animals, while swimming at a beach near Sydney. Blue-ringed octopuses contain tetrodotoxin, a powerful neurotoxin that can paralyze and kill humans even in small doses. There is no known antidote for tetrodotoxin, and death can occur anywhere between 20 minutes and 24 hours after the toxin enters the body. Despite being so toxic, blue-ringed octopuses have caused only three confirmed deaths.