Several beaches in Spain were temporarily closed last week following the rare appearance of “blue dragons,” small but venomous sea slugs officially known as Glaucus atlanticus.
Measuring only three centimeters, the creatures float on the water’s surface, blending into the waves with silver-grey undersides and flashing vivid blue from below.
Despite their striking appearance, they pose a danger to humans. By feeding on Portuguese Man-O’-war jellyfish, they absorb stinging cells, which are then transferred to their finger-like appendages.
Contact with them can cause severe skin irritation, nausea, pain, or even allergic reactions.
In Guardamar del Segura, mayor José Luis Sáez raised the red flag to prohibit swimming after repeated sightings, warning of risks to unaware beachgoers. Local police also advised residents not to touch the animals if they wash ashore. Authorities noted the creatures continued appearing with increasing frequency along the coast in late August.
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