Why it's awesome: These tiny marine creatures are probably better known by their nickname, "Shaun the Sheep" sea slugs, because of their uncanny resemblance to the iconic TV character. The adorable ...

If you ever dive in the tropical waters of the Philippines, Japan, or other parts of Asia and Oceania, you might encounter a tiny, enchanting creature that looks as if it belongs in a Pokemon game.

Blue dragon sea slugs. Glaucus atlanticus. Floating sapphires. Call these curiously cute little creatures whatever you’d like—just don’t call them your friend. They won’t love you back, and it’s a ...