Actinia tenebrosa, commonly known as the waratah anemone, is the most common species of sea anemone found in the waters of eastern Australia and New Zealand (where it is known in Māori as kōtore, or kōtoretore). It is found relatively high on the seashore, in rock pools, and various cracks and shaded surfaces such as under rock overhangs in the intertidal zone.

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