A cool video has emerged of a 'mimic octopus' which appears to imitate a lionfish off the coast of Lombok in Indonesia.

The footage, shot late last month by divers, shows the octopus spreading its tentacles and changing colour to take the appearance of a poisonous lionfish.

"This small octopus, that was only discovered in 1998, imitates other marine creatures to camouflage and protect itself - in the end you can see it mimic a lionfish with its widespread poisonous spines," the filmer wrote online.