Talking about giants I've found this !
Giant squids can reach huge sizes of 13 meters (43 ft) but, without excluding his tentakels that can grow arround 5 meters ! These squids are extremly rare to find. And when people find these giants of the sea they are commonly in bad shape. These squids have established a good place in the human imagination. (look picture) Don't get a bad impressions about these creatures they only eat other squids and fish. Well to have a beter view about the history of giant squids I've found this nice video.
