I've been saving this picture from the Great Barrier Reef specifically for the holiday season that is now upon us. What's festive about this, you ask? They're Christmas Tree Worms!

These guys are shy guys too! Well, not like Super Mario's shy guys, but with each passing shadow or the slightest touch, they retract into their little burrows in the coral. If you wait a minute, they slowly reemerge looking as pretty as they did when you spotted them.