Christmas tree worms have eyes that breathe, gills that see
Improvised eyes help the marine invertebrates sense danger
![Christmas tree worms](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/01/020616_notebook_alive_feat_free.jpg?fit=860%2C460&ssl=1)
GOOGLY EYES These technicolor trees aren’t plants. They’re the gills of Christmas tree worms, which hide below in tubes within the coral.
Nick Hobgood/Wikimedia Commons (CC BY-SA 3.0)