Blue dragons, a type of sea slug known for their potent sting, have appeared along Spain’s coastlines, prompting beach closures and raising concerns about the warming Mediterranean Sea. The presence of these creatures, which can cause severe reactions in humans, has prompted local authorities to take precautionary measures. A photograph of a blue dragon was shared on the Facebook page of the Guardamar del Segura police department, highlighting the growing concern over the impact of climate change on marine ecosystems.