Mysterious, 20-million-year-old tunnels in the ancient ocean floor came from 6-foot-long carnivorous worms, a study found (via Louis)

An illustration of a bobbit worm in its undersea tunnel. 

Courtesy of Ludvig Löwemark

• Bobbit worms explode out of tunnels on the ocean floor to ambush prey.
• According to a new study, these worms had 6-foot-long carnivorous ancestors that burrowed under the Pacific Ocean.
• Researchers found 20-million-year-old tunnels made by these prehistoric worms in Taiwan.

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