An Australian teenager had a lucky escape after being bitten by one of the world's most toxic animals, a blue-ringed octopus, after accidentally picking up the deadly cephalopod hiding in a shell. But ...

Blue-ringed octopi are some of the deadliest marine life in the ocean, though they rarely bite humans. There are several species of blue-ringed octopus, part of a genus known as Hapalochlaena. They ...