Fish living in dark caves still feel the rhythm of life

A blind, cave-dwelling fish in Somalia knows what time it is, but its day is twice as long as ours.

Most animals have an internal body clock, or circadian rhythm, that lasts around 24 hours and is modified by the light-dark cycle of a day.

But an international team, whose research is published in the open access journal PloS Biology, shows that certain blind cave fish have a circadian rhythm that lasts almost two days — via redwolf.newsvine.com