Blue-ringed octopuses carry a killer concoction called tetrodotoxin (TTX), a potent neurotoxin that can paralyze living things, including humans. Tetrodotoxin is most famously known from pufferfish — ...

An Australian teenager had a lucky escape after being bitten by an extremely toxic blue-ringed octopus. A toddler also came close to touching the deadly cephalopod.

The TTX that a blue-ringed octopus injects is so deadly that 1 milligram of it can kill a human. It's one of the most potent toxins on earth, and there is no antidote.

Blue-ringed octopi are small in size: no larger than approximately 2.5 inches long, with arms that are about 4 inches long. Most of the time they’re yellow or sand-colored, but bright blue rings ...

For example, in 2006, a four-year-old boy in Australia survived two blue-ringed octopus bites because his mother identified the threat and sought care within 20 minutes of the bite.

Picture an octopus that could be deadly to humans. You’re probably thinking of a large creature, and not one that is the size of your palm. But indeed, that’s the blue-ringed octopus, one of several ...

There are four species of blue-ringed octopus and each one contains tetrodotoxin, which is one of the most deadly toxins in the world. (Image credit: Khaichuin Sim via Getty Images) ...

An unnamed woman was bitten twice by a blue-ringed octopus, which contains one of the most dangerous neurotoxins on the planet, but she escaped relatively unharmed. Skip to main content.