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Two blue dragons, or Glaucus atlanticus, were found on the beaches of Guardamar del Segura in the Alicante province of Spain on Wednesday, Aug. 20

The presence of the poisonous animal caused the beaches to be closed

The beaches were reopened on Thursday, Aug. 21

The beaches of Guardamar del Segura in the Alicante province of Spain were closed on Wednesday, Aug. 20, after two blue dragons, or Glaucus atlanticus, were found in the waters.

José Luis Sáez, the mayor of Guardamar del Segura, announced on X that swimming was prohibited following "the appearance on Vivers Beach of two specimens of Glaucus atlanticus, known as the Blue Dragon." The beaches of Guardamar del Segura span seven miles, per Sky News .

With his announcement, Sáez added two photos of the blue

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