The Southern Blue Ring Octopus (Hapalochlaena maculosa), South Australia, Australia, Pacific

Poisonous Blue Ring Octopus, Hapalochlaena lunulata, Ambon, Moluccas, Indonesia

Poisonous Blue Ring Octopus, Hapalochlaena lunulata, Ambon, Moluccas, Indonesia

Poisonous Blue Ring Octopus, Hapalochlaena lunulata, Ambon, Moluccas, Indonesia

Poisonous Blue Ring Octopus, Hapalochlaena lunulata, Ambon, Moluccas, Indonesia

A greater blue-ring octopus, Hapalochlaena lunulata, crawls across a coral reef in Komodo National Park, Indonesia. There are several blue-ring octopus species and all of them are extremely venomous.

Blue ring octopus displaying rings, Hapalochlaena sp., Lembeh Strait, Manado, North Sulawesi, Indonesia, Pacific Ocean

Australia, Venomous Blue Ringed octopus (Hapalochlaena maculosa) attached to sea sponge.