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This octopus has one blue ring on either side of its head, which it displays to warn off potential predators. It can also change its color, as you can see in the 4th picture. It's said that this type of octopus is very rare.
Sandy and rubble areas of coral reefs, at depths of 1 to 40m.
Spotted this octopus at a depth of about 40 feet, during a day dive. It was about twice as big as my hand if it had its tentacles stretched out.
Spotted on Jan 7, 2012
Submitted on Jan 10, 2012
and 9 other people favorited this spotting