The killer blue dragons sea slug, also known as Glaucus atlanticus, feeds on the deadly Portuguese man o’ war and other venomous aquatic beasts and is known for its dazzling appearance Blue dragon sea slugs can be lethal (Image: SOLARPIX.COM)

British tourists have been issued with a ban from going into the water along an entire seven-mile stretch of Spain’s Costa Blanca because of rare sea creatures with a potentially-fatal sting. Reg flags went up on beaches in the municipality of Guardamar del Segura, just north of Torrevieja, Spain following the appearance of so-called blue dragons, which have been branded “the most beautiful killer in the ocean.” ‌

The killer sea slug, also known as Glaucus atlanticus, feeds on the deadly Portuguese man o’ war and other venomous aquatic

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