Parchment worms are best pinched in the dark
Tube-dwellers make a mysterious glowing mucus
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2014/07/alive_1.jpg?fit=860%2C460&ssl=1)
GLOW WORM Parchment worms use their filmy flaps to pump water through the tubes they build around themselves. This one has been removed from its U-shaped home.
D. Deheyn/Scripps Inst. of Oceanography, UCSD