Sea Pen🌊🖋️ The Ocean's Glow Stick | All About Animals @topfans The Sea pen is a colony of tiny animals called polyps that work together like a team—some feed, some protect, and others rest. Though it looks like a glowing feather planted in the ocean floor, it's not a plant but a distant relative of corals and sea anemones. Sea pens can retract into the sand when threatened and glow (bioluminesce) as a defense mechanism. They live in calm, deep waters and have existed for millions of years, com