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 — ...

A blue-ringed octopus is one of several species of small octopuses that display small, bright blue rings on their body when they are alarmed. They live in tide pools and shallow reefs.

There have only been three confirmed deaths from blue-ringed octopus bites—two in Australia and one in Singapore—however, some argue that this number is as high as 11. Read more ...

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) ...

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 ...

The blue-ringed octopus appears grey or beige with light brown patches when it is at rest, but when agitated its 50 or 60 bright blue rings appear and pulsate with color, as a warning.

But when it comes to blue-ringed octopus, this is a definite no-no. If you see one, look, don't touch — just admire it from a distance. And certainly don't try and eat a live octopus, like the ...