Glaucus atlanticus, commonly known as the blue dragon, is a small, brightly colored sea slug found in warm ocean waters. It belongs to the family Glaucidae and is known for its striking blue and silver coloration, which helps it blend into the ocean surface and avoid predators. This creature can grow up to 3 centimeters in length and floats on the water's surface due to a gas-filled sac in its body. The blue dragon primarily feeds on jellyfish, consuming their stinging cells and using them for its own defense. When threatened, it can release these stinging cells, making it potentially dangerous to humans. Despite its beauty, Glaucus atlanticus is a fascinating example of adaptation in marine life.