GUARDAMAR DEL SEGURA, Spain – Recent sightings of a tiny blue sea slug with a powerful sting have closed beaches in southeastern Spain.

Blue Dragon sea slugs are around an inch long and have unique blue markings and tendrils that look like wings, creating the slug's dragon-like appearance.

According to police in Guardamar del Segura , beaches in the area were closed twice in just one week at the end of August because of the sea slug's presence.

WHAT ARE THESE ALIEN-LOOKING SLUGS THAT CAN WASH ONTO BEACHES?

On Aug. 20, the police took to Facebook to warn of the danger. Three days later on Aug. 23, the beaches were closed again for swimming.

"Due to the massive appearance of the Blue Dragon (Glaucus atlanticus), and for citizen safety reasons, SWIMMING is PROHIBITED on all beaches of th

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