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 ...

The blue dragon may be too weak to resist the ocean's current, but it can take on a Portuguese man o'war and even steal its venom. When you purchase through links on our site, we may earn an affiliate ...

Blue sea slugs were believed to prey on the Portuguese man-of-war, which contains highly poisonous nematocysts, and uses the nematocysts for defense by incorporating them into the tips of its lateral ...