Loss of vision meant energy savings for cavefish
In dark, sight can be costly, novel measurement finds
![Mexican cavefish](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/09/091115_sm_cavefish_free.jpg?fit=860%2C460&ssl=1)
VISUAL ECONOMY An unusual measurement shows how much Mexican cavefish — with no eyes — save on metabolic costs since the cave population lost its vision.
D. Moran