This is the blind Mexican cavefish (Astyanax mexicanus) along with its sighted cousin the Mexican tetra. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted ...
Sleep is thought to be vital for the health of animals including us, but one kind of cavefish can somehow manage without it. Yet the cavefish appear to be healthy despite this lack of sleep, with ...
About 20,000 years ago a silvery fish called the Mexican tetra was trapped in caves. Living in the dark and in water with less oxygen, its body slowly changed. Most surprising is that it has the ...
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