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The Portuguese man-of-war received its name from 18th century sailors who reported a creature that looked like a Portuguese ship, and with its long stinging tentacles it looked as if it were out to war, thus receiving its name Portuguese man-of-war.

The Portuguese man-of-war is a form of jellyfish, which can be found throughout the tropical seas of the world. This jellyfish has a crested shell that floats above the water, it is filled with gas that keeps it afloat and works like a sail.

The jellyfish itself is made of a cluster of polyps, which are known, as colonies. Each colony has a different purpose, some are sensory units, some are for feeding, some are for digesting food consumed and some are for breeding. This jellyfish will eat anything that comes in contact with its stinging tentacles. Which consists of small fish, plankton, and algae.

The Portuguese man-of-war reproduces asexually, this means it reproduces without another mate. It can reproduce itself. The colonies form new polyps and then release them into another area. Then the new polyps form new colonies, these new colonies then evolve into larger colonies. At this stage a shell has developed and it has developed into an adult Portuguese man-of-war.

There are vast numbers of the Portuguese man-of-war. Their populations are not under immediate threat.