What happened: A rare sea slug known as Blue Dragon appeared on the North Padre Island shore near Corpus Christi.

Why it matters: Blue Dragons feed on a venomous jellyfish called Man o' War, suck the poison, and release it when threatened, said Marine Biologist and Director of the Mission-Aransas Reserve, Jace Tunnell. "It's very painful. If you're allergic and get stung, you'll have to call 911 or go to the hospital immediately."

What now: Tunnell advised that the rare animal can be dangerous. "Don't touch or pick up any blue dragons, because their stings hurt!”