Blue-veined Octopus at Anilao Batangas Pier, Philippines

“This octopus displays tool-using behavior as it utilizes an empty shell for shelter and as a means of defense and protection.” -- Nature's Best photographer, Jeffrey de Guzman.

See more beautiful ocean photos in our slideshow of winners from the 2010 Nature's Best Ocean Views photo contest.

Blue-veined Octopus at Anilao Batangas Pier, Philippines
Jeffrey de Guzman/Nature’s Best Photography

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