Blue-ringed octopus

The blue-ringed octopus, also called spectacled octopus, is a mollusk particularly widespread in the Western Pacific. Despite he mostly eat shellfish and shrimp, only one exemplary is able to kill more than 20 men. His weapon is in the saliva, which contains a lethal poison for anyone who comes into contact. Besides, with its beak it can penetrate any wet-suit and kill within minutes.