Octopuses have six "arms" and two "legs": study

"Octopuses' eight tentacles divide up into six "arms" and two "legs", a study published by a chain of commercial aquariums said on Thursday.

Octopuses are reckoned to be the world's most intelligent invertebrates and are able to use tools with their sucker-covered tentacles.

Helped by over 2,000 observations by visitors, teams of aquatic specialists carried out a study showing that the creatures seemed to favor their first three pairs of tentacles for grabbing and using objects, Sea Life aquariums said."

http://www.reuters.com/article/scienceNews/idUSLE12120720080814