Juergen Freund / Pacific blue ring octopus {Hapalochlaena maculosa} Indo Pacific

Jeff Rotman / Pacific blue ring octopus at night (Hapalochlaena maculosa) Australia

Constantinos Petrinos / Pacific blue ring octopus {Octopus maculosa / lunulata} note enlarged blue rings of agitated animal; toxic species. Lembeh, Sulawesi, Indonesia. Colour change Sequence.

Constantinos Petrinos / Pacific blue ring octopus {Octopus maculosa / lunulata} has blue rings that enlarge when agitated; toxic species. Sulawesi, Indonesia. Colour change Sequence.

Juergen Freund / Pacific blue ringed octopus {Hapalochlaena maculosa} Sulu-sulawesi seas, Indo-Pacific

David Fleetham / Pacific blue ring octopus (Hapalochlaena maculosa) on orange sponge, South Australia.

Nature Production / Pacific Blue-ringed Octopus {Hapalochlaena fasciata} Izu Osezaki, Shizuoka, Japan, January

Carine Schrurs / Pacific blue ring octopus swimming {Hapalochlaena maculosa} Sulawesi Indonesia

Carine Schrurs / Pacific blue ring octopus on coral {Hapalochlaena maculosa} Lembeh strait Sulawesi

Fred Bavendam / Southern blue-ringed octopus (Hapalochlaena maculosa) female, carrying eggs, Edithburgh, South Australia, Great Australian Bight.

Fred Bavendam / Southern blue-ringed octopus (Hapalochlaena maculosa) female carrying eggs, resting on seabed, Edithburgh, South Australia, Great Australian Bight.

Fred Bavendam / Southern blue-ringed octopus (Hapalochlaena maculosa) female carrying eggs, Edithburgh, South Australia, Great Australian Bight.