Blue Sea Dragon
Glaucus atlanticus
A tiny upside-down dragon steals stings from its lunch.
Blue sea dragons are floating sea slugs that ride the ocean surface upside down. They eat stinging animals and save some unfired stinging cells for their own defense.
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From field guide to game table
Bring this Blue Sea Dragon home
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- 1 copy
Ready-to-play deck
Open Ocean Deck
Includes 1 card featuring Blue Sea Dragon.
Quick dive
Creature passport
- Home
- They drift at the surface of tropical and temperate oceans around the world.
- Favorite foods
- They prey on Portuguese man o' wars, blue buttons, and other floating relatives.
- Size check
- Usually under 2 in (5 cm)—about thumb length
Tell-your-friends facts
Four wonderfully wild things
- 1
A swallowed air bubble in the stomach helps the slug stay afloat.
- 2
It floats belly-up, so its blue side faces skyward and silver side faces downward.
- 3
Each blue sea dragon has both male and female reproductive organs.
- 4
Its stored stings can still hurt people, so stranded animals should not be touched.
Ocean superpower
Built to be amazing
Stolen stinging cells are stored in finger-like tips and reused against attackers.
Junior scientist tip
What should I look for?
Find a tiny silver-blue slug with six clusters of feathery, finger-like arms.
Grown-up research links
We used trusted science organizations to check this profile.