25 strangest creatures on Earth that you probably don't know

24. Glaucus Atlanticus


Also known as the blue dragon (blue glaucus), this creature is a species of blue sea slug. You could find it in warm waters of the oceans, as it floats on the surface because of a gas-filled sack in its stomach.

Fun facts:

  • Blue glaucus can grow up to 1.2 inches (3 cm) long.
  • Blue glaucuses eat large, venomous prey, such as the Portuguese man o’ war and the blue button jelly, and store their prey’s stinging cells in their bodies to later use against predators.
  • Blue glaucuses can swallow air and hold it in their stomach in order to float on the water’s surface.
  • A group of blue glaucuses floating together is called a “blue fleet.” These “blue fleets” often wash ashore and can sting people swimming in the water.
  • Blue glaucuses lay eggs on their prey’s carcasses or other floating masses.

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