A blind cave fish that has spent millions of years underground isolated from evidence of day and night still has a working biological clock, albeit an unusually distorted one, scientists find. This ...

In the underground caves of north-eastern Mexico, groups of blind fish appear to be developing cave-specific accents. The linguistic split could eventually contribute to ongoing speciation among the ...

Cave living animals have originated in the most diverse systematic groups and deliver outstanding examples of the convergent loss of traits that have become biologically useless, and the simultaneous ...

Deep beneath the Amazon rain forest lives a cave-climbing fish—and scientists have captured it on film for the first time. A team exploring limestone caves near Tena, Ecuador (map), found the ...

Blind fish that spend their lives in dark, underwater caves have lost a huge chunk of their ability to hear, scientists report in the March 27 Biology Letters. Two of the fish species studied could ...

About 250 species of subterranean fish are known on Earth, eking out a living in a world of permanent dark and scant food. They are usually small, generally a few inches long, since there’s usually ...