Authorities in southeastern Spain were forced to temporarily shut down a popular stretch of sand earlier this week after two venomous sea creatures known as “blue dragons” were spotted.

The town of Guardamar del Segura, located just north of Torrevieja on Spain’s Mediterranean Costa Blanca, implemented a swimming ban across all beaches after the rare marine animals — scientifically named Glaucus atlanticus — were discovered in the water near Vivers Beach. 3

“For motives of citizenry safety, we have banned all swimming on all of the municipal beaches until a new order,” the Guardamar police force said in a Facebook post .

Despite its beautiful appearance, the blue dragon is a potentially deadly sort of sea slug.

Measuring just 3 to 4 centimeters in length, these nudibranchs are r

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