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COASTAL CLASSROOMS Explore stories, science, values and stewardship from the places we protect.
SOUTHERN BLUE-RINGED OCTOPUS Flashes of Blue, Warnings for You!
Habitat
Found in shallow coastal waters of Australia, Indonesia, and the western Pacific, they inhabit rock pools, reefs, and seagrass beds. They often hide under rocks, shells, or in crevices during the day.
Diet & Predation
They prey on small crabs, shrimp, and fish, using their beak to inject venom and paralyse their prey. Their excellent camouflage and ambush tactics make them efficient predators.
Lifespan & Reproduction
They live only about 1-2 years. Females lay a single clutch of eggs and die shortly after the eggs hatch. During brooding, the female does not eat, focusing entirely on protecting the eggs.
Warning!
When threatened, they flash vivid blue rings as a warning. Though not aggressive, they will defend themselves if provoked. Measuring just 12–20 cm (including tentacles), they carry venom strong enough to kill a human. A bite delivers tetrodotoxin, a neurotoxin that causes paralysis. There is currently no antivenom—bites require urgent emergency medical care.
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