- Researchers have shown that well-developed eyes come at a surprising cost to other organ systems. The study involving Mexican cavefish shows that the visual system can require between 5% and 15% of an animal's total energy budget. http://www.theguardian.com/science/neurophilosophy/2015/sep/11/blind-cave-fish-evolved-an-energy-saving-shrunken-brain 559 comments science
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