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Blue dragon nudibranch — printable fact sheet
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Blue dragon nudibranch
Glaucus atlanticus
Glaucus atlanticus is a 3 cm sea slug that lives upside down on the surface of the open ocean, hanging from the underside of the water's surface film and kept there by a bubble of gas it swallows and holds in its stomach. It feeds on the most dangerous drifting animals in the se…
Did you know?
- Despite their small size and delicate appearance, blue dragons can deliver a painful sting to humans if handled.
- Blue dragons wash ashore in swarms alongside the man o' war they follow, and they can sting after death, so beached ones should not be picked up. Because it is a slug living at the air-water interface, it belongs to the neuston — the thin community of animals that live in the top few centimetres of the entire open ocean. It cannot swim in any meaningful sense: it goes where the wind and current take its prey.
What I learned
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