Last week, a 'blue fleet' of tiny dragons forced the closure of several beaches in Spain.

Sometimes referred to as blue angels, the colorful creatures are a rare sight in the Mediterranean. Viewed from above, the silver-grey 'bellies' of these surface-floating sea slugs ( Glaucous atlanticus ) camouflage with the waves. But from below, they flash gorgeous streaks of bright blue.

While stunning to look at from a distance, the 3-centimeter (1.2-inch) long marvels should not be touched. If they had an anthem, it would surely be Beyoncé's Pretty Hurts .

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They themselves are only venomous because their prey is, though. When sea dragons eat blue bottles like the Portuguese Man-O'-war , they ingest the stinging cells an

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