Ancient 'Naked' Worm Did a Little Dance to Catch Seafood

About 500 million years ago, a squishy, thumb-size sea creature did a little dance — waving its upper limbs around in the ocean in a never-ending attempt to ensnarl some tasty morsels floating by. Researchers found the remains of this newly identified critter in the Burgess Shale deposit, a world-famous area in the Canadian Rockies that's brimming with animal fossils from the Cambrian Period (540 million to 490 million years ago). "The Burgess Shale is certainly no stranger of already biza