Often mistaken for a jellyfish, the Portuguese man-of-war is actually made up of a colony of organisms working together.

The moon jellyfish are, in fact, just about everywhere, including Mexico, Alaska and along the Atlantic Coast of the United States. They include the stinging Portuguese man-of-war.

Far to the north, a much more menacing species looms - the Portuguese Man-of-War, a floating, violet-coloured sack with long tentacles.