Did you know that most jellyfish just ride the currents of the ocean looking for food? Not the Portuguese Man O’ War, it has a gas filled bladder it used to float to the surface and sets sail using a vertical membrane to catch the wind. These fascinating jellyfish can be over 30 feet long and symbiotically harbor Man O’ War fishes that have become desensitized to their lethal sting. Man O’ War can, in rare cases, even kill human with their sting. Learn more in this video from BBC’s Blue Planet II.

https://youtu.be/aIovmgzyuL0

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