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The anemone is native to New Zealand and Australia. It can grow up to 20cm long, and is our country’s largest sea anemone.
Most sea anemones spend their life attached to a surface, but the wandering species "has opted for more mobile existence drifting among dense seaweed", Te Ara: The Encyclopedia of New Zealand says.
Concealed tentacles are filled with stinging cells which poison and capture passing prey, including small fish.
Centre curator Adelle O’Neill said the "enigmatic" anemone, about 10cm long, was found recently in Otago Harbour.