Don’t be fooled by its small size and dazzling blue rings this tiny octopus carries enough venom to kill 26 people in mere minutes. With no known antidote, the blue-ringed octopus is one of the ...

Cephalopods have colour-changing chromatophores on their skin, which allows them to camouflage themselves — but the blue-ringed octopus has a different trick up its tentacle. Michelle Starr is ...