However, the "Portuguese Warship" is not a true jellyfish, but a complex colony of four types of polyps. The Portuguese man-of-war can develop tentacles up to 70 meters long. In addition to the body, which is on average 9 to 35 cm in size, it has a gas bladder, which serves as a "sail". This sail, which is in fact a polyp (pneumatophore), can be filled with air if the warship needs to remain on the surface, and can deflate in case of danger, causing the warship to submerge. This sail can also be turned in a certain angle, so that the colony can "determine" where it "wants" to go. It is even possible to tack against the wind.