naturebriefs
10:37in productionCh. 1 · Where it was found/ 10:37 · ceiling 15 min
Fish & sea life

Mimic octopus

The only animal that mimics several species — and it does it in mud.

The mimic octopus is a cephalopod native to the Indo-Pacific. It uses chromatophores to impersonate multiple marine animals. It was first discovered in 1998 in a muddy river mouth off Sulawesi, Indonesia. Most observations remain from Indonesia. It inhabits shallow soft-bottom habitats including river mouths and estuaries. It feeds on small fish, crabs and worms. It is one of only two animals known to actively imitate several species to elude predators.

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Chapters & takeaways4
  1. 1:12
    Where it was found

    Discovered in 1998 in a muddy river mouth off Sulawesi — and still mostly seen there.

  2. 2:40
    How it disguises itself

    It changes colour and swims like a flatfish — using chromatophores, not costume.

  3. 4:26
    What it mimics

    It impersonates multiple marine animals — and it is one of only two animals known to do so deliberately.

  4. 6:30
    Where it lives now

    Its range stretches from the Red Sea to New Caledonia — but almost all sightings are from Indonesia.

Worth your time?

Yes. See the whole thing.

4.5/ 5
What works
  • coordinated colour-shape-movement mimicry
  • flatfish swimming during rest and hunting
  • impersonation of multiple dangerous species
What does not
  • inhabits coral reefs
  • lives in deep water
  • mimics terrestrial animals
See it if
  • divers in Indo-Pacific estuaries
  • marine biologists studying soft-bottom habitats
Skip it if
  • reef snorkellers
  • aquarium visitors
The written brief1 min read

What the species is and where it came from

The mimic octopus (Thaumoctopus mimicus) is a cephalopod native to the Indo-Pacific, first documented in 1998 on the muddy bottom of a river mouth off Sulawesi, Indonesia.

How it works, in terms someone would actually use

It uses chromatophores to change colour, shape and movement — impersonating flatfish, lionfish, sea snakes and others while hunting or resting in shallow muddy water.

What it gets right

It gets disguise right: coordinated colour, posture and locomotion let it pass as multiple dangerous or unpalatable animals.

What it does not

It does not inhabit coral reefs, rocky shores or deep water. It does not mimic terrestrial animals or non-marine species.

What it changed

It redefined mimicry: no other animal is known to actively imitate several distinct species for both defence and offence.

Who it is for, and who it is not

It is for divers, marine biologists and naturalists working in soft-bottom Indo-Pacific habitats — not for reef snorkellers or aquarium visitors.

Is it worth your time

Yes — if you are diving or snorkelling in Indonesia’s river mouths, Sulawesi estuaries or the Gulf of Thailand, where most observations occur.

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