11. Blue-Ringed Octopus
This octopus is tiny but as you might have the guest, this octopus is really deadly. It kills its victim in a very cruel way. It bites the victim and injects a poison into the bloodstream after that the victim get paralyzed within a few minutes which of course means they can breathe. The only way to help a person, in this case, is to start the artificial restoration and continue to do it for the next few hours until the effect of the poison wears down.