They're tiny, blobby, butt-shaped, and glow in the dark. What the heck are they? Scientists are still figuring them out.

The bobbit worm is a gorgeous creature ... Interestingly, smaller sand strikers are sometimes found in home aquariums because of their ability to hide in live rocks that are used in tanks.

Different polychaete species use their bristles for different purposes, according to the Monterey Bay Aquarium Research Institute (MBARI). In this case, Antarctic scale worms' shimmering golden ...