St. Patrick’s Day is almost here, a holiday famous for parades, parties, and everything turning so green that it’s like looking at the world through night-vision goggles. But when we think “green” we sometimes think “eco,” so in honor of Green Day here are five of nature’s “greenest” animals, not in color but in habit. Whether it’s home decor or an entire home, these animals all recycle.

Just like Molly Ringwald in Pretty in Pink, the decorator crab uses whatever it has at hand (or claw) to create its ideal look. For the many species of this crustacean sensation, the look is camouflage. Decorator crabs are covered with hooked hairs (called setae), nobs and spines to which they attach bits