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ANIMAL SPECIES:Common Sydney Octopus

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This is the largest octopus commonly seen in Sydney.

Alternative Name/s

Gloomy Octopus

Identification

The undersides of the arms of the Common Sydney Octopus are rust red in colour, tapering to a tip, which may be the first thing you spot emerging from under a rock ledge.

Size range

80 cm

Distribution

The Common Sydney Octopus is found in New South Wales.

Habitat

The Common Sydney Octopus is found on intertidal rocky shores and in the ocean.

Behaviour and adaptations

Feeding and Diet

At night the Common Sydney Octopus hunts using its sharp beak to feed on crabs and molluscs, such as snails and bivalves. It can change the colour of its skin (normally mottled brown) and shape to imitate seaweed.

Other behaviours and adaptations

The Common Sydney Octopus is territorial and sits in its lair during the day surrounded by rocks and rubble that it has collected to defend its home. 

The octopuses' fleshy mantle can be used for jet propulsion by sucking in water and squirting it out through the siphon above. Most of the time though, they use their eight suckered arms to creep about over rock surfaces in search of food.

Octopuses are protected and cannot be taken from ocean rock platforms or Sydney Harbour.

Classification

Species:
tetricus
Genus:
Octopus
Phylum:
Mollusca
Kingdom:
Animalia

What does this mean?


Last Updated: 5 January 2010

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Common Sydney Octopus

Common Sydney Octopus View full size
Kevin Deacon © Kevin Deacon

Common Sydney Octopus showing tentacle

Common Sydney Octopus showing tentacle View full size
Kevin Deacon © Kevin Deacon

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